List of Medaka Box characters

This is a list of characters from the manga series Medaka Box by Nisio Isin. The series follows the efforts of Student Council President Medaka Kurokami, a young woman with extraordinary capabilities, as she works to improve Hakoniwa Academy, with the aid of her closest friend, Zenkichi Hitoyoshi.

A large number of students at Hakoniwa Academy are scholarship students, allowed to enroll at Hakoniwa because of their ability to excel in a specific area and are generally known as Specials. Student Council members Kouki Akune and Mogana Kikaijima qualify as Specials. More extraordinary students are known as Abnormals, who are individuals possessing overwhelming capabilities such that the individual is unable to control that aspect of themselves and inherently seek to master their abnormality. Introduced the anti-thesis to Abnormals are Minuses, students who have no inherent interest in controlling their abnormalities and have no sense of morality. Rather, they thrive on destruction, regarding themselves as unworthy, unable to relate to others, and have no sense of responsibility. Students who lack any special ability, such as Zenkichi, are known as Normals.

Student Council

 * Medaka Kurokami (黒神 めだか)
 * The female protagonist of the series and 98th Student Council President of Hakoniwa Academy. Beautiful and well endowed, which she has no shame in showing off whenever possible, Medaka is an excellent academic student, placing first in the national test. In addition to her academic achievements, she has excelled in various other areas, such as calligraphy and sports, and obtained seemingly inhuman results. When the series begins, she has just been elected the new student council president by an unheard-of margin of 98% of the total votes, even though she is still only a first-year student. Medaka institutes a suggestion box in which students can drop suggestions for various tasks that the students feel would improve the academy. Medaka planned on just her and Zenkichi Hitoyoshi running the student council, but as the story continues, Medaka recruits more people to fill the council positions. Her personality is one of helping others, and she determines to finish any task handed to her. For every task she completes, Medaka buys a vase with flowers. She one day hopes to have completed so many suggestions that she fills the entire academy with blooming flowers. She has an older brother whom she despises but at the same time holds some degree of begrudging respect for. She also has an older sister whom she looks up to and loves deeply.


 * Medaka grew up in a family of four: her father, older sister, and older brother. Her mother died giving birth to her; members of the Kurokami Company coldly said her mother existed only to give birth to her. Because of her abnormal abilities, she quickly matured and was selected to be part of the Flask Project. However, she ran away after being confronted with the realization that life has no meaning. This was when she met Zenkichi Hitoyoshi for the first time. Medaka, with the only way she was taught, talked in an arrogant tone with him, but much to her surprise, Zenkichi did nothing but smile. When Medaka asked him what the point of her life was, he smiled and replied, "I'm sure you were born to make the people around you happy." Thus, Medaka was reborn and the unbreakable bond between Zenkichi and Medaka begun.


 * The bond between Zenkichi and Medaka can be described as childhood friends. Medaka was incredibly lonely as a child due to her skills. In middle school, Medaka had a classmate whom she tried to help but failed to do so. Her failure to do so ended in the death of another classmate. As a result, Medaka was emotionally scarred. In hopes of protecting her, Zenkichi vowed to prevent anyone similar from getting close to her again. According to Medaka, she and Zenkichi have been together since they were two years old. It is only in Chapter 35, while Zenkichi is fighting Munakata, that Medaka confesses her love for Zenkichi to the other Student Council members. In chapter 36, when Zenkichi falls to Munakata, Medaka breaks down in tears. After Medaka was brainwashed, it was due to this bond between Medaka and Zenkichi that he was able to return her back from her old personality.


 * Medaka's abnormality, identified as "The End" by Naze, is her ability to copy and master other people's abnormalities. It is this ability that draws the interest of the Flask Plan, as she appears to be the one person who can achieve the ideal of the "Perfect Person". It has been commented, by herself no less, that only she can hold this ability, because she is a beast and no human would be able to withstand it. When Oudo tried to steal her abnormality with his "Unreasonable Taxation" abnormality, he states that it was, "Dark enough to black out the sun"


 * Zenkichi Hitoyoshi (人吉 善吉)
 * The male protagonist, childhood friend of Medaka, and the Student Council General Affairs Manager, reluctantly joining for the sake of protecting Medaka; in the pilot chapter, Medaka assigns him to become the Vice President. Zenkichi always shows enthusiasm toward Medaka’s cause for helping others and will punish anyone who opposes that cause. It is later revealed that he is the one who reformed Medaka into her current personality. It is implied he has feelings for her.  Little is known about Zenkichi's past except that he has been with Medaka since they were two years old.


 * Zenkichi is noted to be a "normal" individual, one with no special abilities. Medaka's brother, Maguro, takes special interest in him because no matter how much he's discouraged or fails, he stands back up. Zenkichi has vowed to protect Medaka ever since she was emotionally scarred after failing to help a classmate in middle school. In order to become stronger, he has undertaken Maguro's hellish training sessions along with Medaka. Zenkichi is revealed to be a master of Savate, having honed his skill to such an extent that he possesses an almost impenetrable defense. According to Zenkichi, he learned this style because he fears fighting and uses it to disarm opponents and take away their desire to fight. He also studied on how to disassemble guns, and rocket launchers, just in case something ever happened to Medaka. Thanks to this display of skill, the Flask Plan is very interested in him, believing him to have the potential to become an Abnormal. However, it has been repeated iterated that Zenkichi, despite his remarkable abilities, is still only "normal." If standard human limits are applied though, Zenkichi has long since passed the line of a "normal"; for instance, when he caused a small earthquake with his stomp. Even if it was biologically possible, a man of Zenkichi's weight and mass would find it impossible. Also, regardless of will, no "normal" is capable of surviving seven katanas and spears, through his solar plexus, internal organs, and still stand, fight, and cause earthquakes, let alone survive.


 * The relationship between Shiranui and Zenkichi is frequently commented on by their classmates, often negatively, on how they interact with each other. Shiranui has commented that she is only friends with him when she is in the mood. Ironically, Shiranui's grandfather notes that Zenkichi is probably the only person who can get along with Shiranui.


 * Kouki Akune (阿久根 高貴)
 * The Student Council Secretary and the oldest member of the Student Council, as he is second year while Medaka, Zenkichi, and Kikaijima are in first year. Originally part of the judo club, Akune has been infatuated with Medaka since middle school and hates Zenkichi for being able to spend so much time with her.  In middle school, he had been a violent delinquent known as the "Destroyer" and had been assigned by the student council to beat Medaka.  While she was injured, she did not fight back; Akune continued until Zenkichi gathered a group of Medaka's supporters to avenge her.  When Medaka stopped Zenkichi from hurting Akune, Akune immediately developed feelings for her, which she refuses, and gradually becomes less violent and shows little desire to actually hurt others.


 * Because of his natural fighting abilities, Akune is known as the "Prince of Judo" and the star of the judo club. Because the captain of the club, Nabeshima, despises natural genius, she arranges a match between Zenkichi (whom she favours) and Akune in order to recruit Zenkichi to succeed her as captain of the judo club if he loses to Akune, who will join the student council.  Akune loses the match, but is still recruited into the Student Council after Nabeshima tells Medaka that Akune that he has beautiful handwriting.  Both he and Kikaijima are considered to be 'specials', above average, but not quite abnormal. It has been said that Akune's ability is being able to copy other peoples abilities, but to a lesser extent.


 * Mogana Kikaijima (喜界島 もがな)
 * The Student Council Treasurer. She is originally the ace of the swim team, befriending Yakushima (swim club's captain), and Tanegashima (swim club's vice captain). All three had an incredible obsession with money for personal reasons and want to gain enough money to fill a pool and swim in it. When Kikaijima was a child, her father left because the family was in debt, and her mother became sick from working herself in to the ground. All the people that Kikaijima had thought were friends left her because her family had no money. Kikaijima believed that "anyone would be sad if they lost their wallet, but if we died, nobody would care." Medaka corrects her by saying that if they died, she would be sad for them.  Afterwards, Kikaijima is recruited as the treasurer, and is the only member of the group who is paid for her job.


 * Though Medaka successfully reforms Kikaijima from old ways, it still does not keep her from being obsessed with money. Shortly after she joins the Student Council, she charges Zenkichi for accidentally seeing her changing and then again for insulting her and one last time for saying she had a great body. She develops strong relationships with the Student Council members, particularly Medaka and Zenkichi, after being encouraged by Yakushima and Tanegashima to make friends outside of the swim club.  Like Akune, she is regarded as a "special" and is one of the school's many scholarship students.  Kikaijima has an incredible lung capacity, allowing her to hold her breath for a month if she chooses.  She can also focus her voice as a sound cannon and destroy physical objects with ultrasonic shrieks.

Class 13
A class consisting entirely of students possessing abnormalities, many are involved with the Flask Plan, an experiment overseen by the Headmaster of Hakoniwa Academy to create a Perfect Human.


 * Myouri Unzen (雲仙 冥利)
 * Project name: Monster Child
 * A high school junior at only ten years old. He is a child prodigy and the leader of the school Enforcers Squad. He is known to go overboard in his methods to bring about justice, but his motto is "Justice is nothing if you don't go overboard!" Unlike Medaka who loves people and thinks they are good inside, Myouri hates people and believes they are evil by nature. He also seems to be quite perverted for his young age, and possess a fetish for big breasted women. After his defeat by Medaka, he reveals the Flask Plan and turns down her offer to join the Student Council as Vice President.


 * Myouri appears to be an abnormal among abnormals. Of the thirteen members of the Flask Plan, he is one among the seven who are able break the complicated code of characters and numbers necessary to use to use the Flask Building elevator. His most frequently used weapons are super elastic bouncy balls, created by scientists of the Flask Plan. He is able to fully calculate the trajectory of each one of his balls no matter how many he throws.  His second weapon are similar in size and shape to the super bouncy balls, but they are balls full of gunpowder. For these he lets them out onto the floor of a contained area and then has to light them externally.His trump card; balls with Nigh-indestructible wires coiled around inside. As he throws these balls they bounce around their target and the surrounding walls letting the string out as they travel. These balls form a web so to speak that renders its victim immobile. This weapon is also a one use item, as Myouri doesn’t want to take the time to re-ravel the thread.


 * Shigusa Takachiho (高千穂 仕種)
 * Project name: Hard Wrapping (棘毛布)
 * The strongest of class 13, his abnormality is his heightened reflexes. Because his reflexes allow him to automatically dodge anything, he has never gotten hurt until he fought with Medaka. His abnormality emerged when he was a child - a car crash killed his family, but his reflexes allowed him to survive unharmed. Since then, he has secretly harbored a desire to be touched, but believes it is impossible because his reflexes instantly prevent contact from others. Shigusa incorrectly states that Medaka’s abnormality is to turn off her reflexes, when in fact it is that she is able to mimic other’s abnormalities. In the end, Medaka came out victorious because Shigusa's muscles could no longer keep up with his reflexes.


 * Kei Munakata (宗像 形)
 * Project name: Last Carpet (枯れた樹海)
 * A senior of Class 13. From the day he turned five, he has harboured incredibly powerful homicidal impulses, driving him on to kill anyone and everyone he looks at. Despite this, he knows killing is wrong and learns how to use a vast and diverse arsenal of hidden weapons as a way to keep people at a distance so he wouldn't hurt them. His weapons range from his bare hands to explosives. After losing a fight to Zenkichi and finally gaining a friend to relieve his loneliness, his impulses have died down and he has gained a great deal more control.


 * Itami Koga (古賀 いたみ)
 * Project name: Best Pain (骨折り指切り)
 * Originally a very normal high school girl, she desired an abnormal lifestyle and pleaded with Youka Naze to make her life abnormal. They became "best" friends ever since and Koga is extremely loyal to Naze and proud of her status as an Abnormal. As a result of Naze's experiments, Koga gained incredible recovery abilities and had everything unnecessary removed by Naze, though her ability to sense pain was left intact. Akune realizes in his fight against Koga that because she was originally an ordinary human, her super-human strength puts excessive tension on her muscles. Without her pain system, Koga would have no way of knowing when her muscles were at their limit. To defeat her, Akune utilizes a pinning move that drains all of Koga's energy.


 * Youka Naze (名瀬 夭歌)
 * Project name: Black White (黒い包帯)
 * The researcher for class 13 and current supervisor of the Flask Plan, Youka Naze's real name is Kujira Kurokami (黒神 くじら), the older sister of Medaka and the younger sister of Maguro. While attractive and possessing a strong resemblance to Medaka, she favours concealing her face behind bandages and embeds a knife in her forehead since she dislikes the attention her face attracts.  As Naze, she was once a classmate of Akune.  Disgusted with the lack of dissatisfying elements in her life, the burdens of having a loving family and similarly extraordinary abilities, she became extremely stoic and driven to find something to make her miserable in life.  Unable to achieve this goal, she ran away and erased her memories to become Youka Naze.  Naze has little interest in the Flask Plan, using it only to further her scientific experiments on becoming normal.  The only thing she truly values is her "best friend," Koga, the only person not to be intimidated by her overwhelming abnormality.  Naze's abnormality appears to be analysis, similar to her brother, and an understanding of biology that exceeds even Medaka.  Her prefered weapons are syringes.


 * Mizou Yukuhashi (行橋 未造)
 * Project name: Rabbit Labyrinth (狭き門)
 * The small masked boy who is usually seen around Oudo, his abnormality is to feel the emotions of other people so strongly that it is as though he is reading their minds. The downside to this power is he is so in tune to other’s emotions that he even feels their fatigue and pain.  Because he could not control his own powers, he was being driven almost insane by the constant babble of the thoughts of all the people and machines around him.  His abnormality is considered the polar opposite of Oudo; while Oudo can be thought of as a transmitter of electromagnetic waves, Yukuhashi is a receiver for electromagnetic waves.  Upon meeting Oudo, all he heard in his head was silence due to Oudo's overwhelming projection of himself; because he had finally found peace and quiet, Yukuhashi has stuck to Oudo ever since.  Because his ability allows him to feel his opponent's feelings, Yukuhashi prefers not to physically fight and resorts to mental games and tactics to win.


 * Oudo Miyakonojou (都城 王土)
 * Project name: Create (創帝)
 * Self-proclaimed King of the World, Oudo believes he was born a king and everyone else a servant to him. He takes a special interest in Medaka right from the start and wishes for her to be his wife. His abnormality can be described as mind-control because he is able to send electromagnetic waves into his opponent's brain. With this ability he has able to force other to obey his commands, which he usually limits to making people bow in his presence. Oudo utilizes this technique to awaken Medaka’s original personality, though his original intent had been to brainwash her into someone subservant only to him. Despite the extraordinary extent of his powers, he has been unable to control them and they have warped his sense of self.


 * Oudo's abnormality manifests as two distinct abilities involving his ability to emit electromagnetic waves. The first is described as "Weighted Words", which allow him to transmit electromagnetic waves to seize control of the physical actions of others by issuing a spoken command and brainwashing others from physical contact.  His second ability is known as "Unreasonable Taxation," allowing him to completely steal another person's abnormality, completely taking it by copying the electromagnetic wave patterns of another person.

Plus Six
The Plus Six consists of members of Class 13 involved in the Flask Plan, whose Abnormalities are far more advanced than the other members of Class 13. They have little interest in aiding Oudo or Naze, but agree to help stall for time during Oudo and Naze's plan to brainwash Medaka.


 * Gunki Itoshima (糸島 軍規)
 * Project name: Death Watch (死番虫)
 * A seemingly hotheaded boy who declares that he is not so cowardly to leave a friend in need. Unzen remarks that Itoshima, along with Hyakuchou, is particularly exceptional among the Plus Six and not the type that should be challenged lightly.  Because of their implied strength, it is suggested that either Itoshima or Hyakuchou is the leader of the Plus Six.


 * Otome Yunomae (湯前 音眼)
 * Project name: Free World (宙ぶらりん)
 * An apathetic girl who speaks in monotone, chews bubblegum, and only wears a pair of overalls. Her abnormality appears to allow others to pierce into her body without harming her.


 * Hamaya Hyakuchou (百町 破魔矢)
 * Project name: Love (初恋)
 * A member of the Plus Six who openly admits to having no interest in the abilities of Medaka Kurokami, but agrees to aid Naze and Oudo so that Oudo will have to return the favour some day. Unzen notes that Hyakuchou and Itoshima are exceptional members of the Plus Six and cautions against making the first move against them.  Hyakuchou's abilities seem to be related to using an archery bow.


 * Yutori Chikuzen (筑前 優鳥)
 * Project name: Trick or Treatment (髪々の黄昏)
 * A girl with long hair that conceals her face; her hair is capable of growing at will and binding a number of opponents extremely quickly. She speaks with a rural dialect.


 * Yamami Tsurumisaki (鶴御崎 山海)
 * Project name: Star Master (占領役者)
 * A boy with a strange mark on his face and speaks in an equally strange manner. He feels disgusted being near normals and would think nothing of getting rid of them.  He is capable of melting iron with his fingers.


 * Shoko Kamimine (上峰 書子)
 * Project name: Dental Shoes (食虫食物)
 * A bookish looking girl who is capable of stopping a barrage of bullets with her teeth. She regards normals, or ordinary people, as trash.

Enforcers
A group of students who charged with enforcing school rules and regulations, viewing themselves as the upholders of justice. The Enforcers consider themselves in opposition to the Student Council and that they are not above the laws of the school. They are led by the charismatic Myouri Unzen and generally will not hestitate to carry out his orders, regardless of how ruthless they may be.


 * Harigane Onigase (鬼瀬 針音)
 * An eager member of the Enforcers, known as "American Cuff Onigase" for her use of handcuffs to apprehend students who have broken school rules. She is displeased with the Student Council's flauting of the school's uniform regulations, which begins the conflict between the Student Council and the Enforcers.  Though she is somewhat zealous and has a strong sense of justice, she does recognize the positive affect of the Student Council.


 * Yobuko (呼子)
 * The deputy head enforcer, a calm and collected young woman who favours the use of heavy chains and hanging students who have broken school rules. She is extremely loyal to Myouri Unzen.

Class -13
Once the Flask Plan was destroyed, the Headmaster put his own personal version of the Flask Plan into action. Selecting students with negative outlooks and corresponding abnormalities, Class -13. The class consists entirely of Minuses, amoral individuals with extreme inherent destructive tendencies who can develop obsessive emotionally shallow or baseless attachments to others. Centred around Misogi Kumagawa, their stated goal is the reduce all abnormals to nothingness to form an environment of entirely equal individuals who possess no abilities.


 * Misogi Kumagawa (球磨川 禊)
 * A young man who was once the Student Council President of his middle school. Much to Medaka and Zenkichi's horror, Misogi transfers into Hakoniwa Academy after the destruction of the Flask Plan. A nihilist who believes that there is no point to life or reason to be born, he has absorbed all the negative aspects of the people he met, he failed at everything and lost to everyone at everything. Medaka attempted to sympathize with him and reform him, like she had done to her other classmates, but Misogi proved to be beyond her influence. Though it hasn't been explicitly shown, it is known that he killed one of his classmates in front of Medaka, which led her to attack him in a fit of rage, resulting him leaving the school. Upon realizing that she couldn't help him, which went against everything she believed herself to be capable of, she was left emotionally scarred. The scar has still not yet healed, as this day she still berates herself over not being able to do anything positive for him.  Medaka describes him as a compulsive liar who places no meaning in trust or doubt while Hitomi Hitoyoshi considers him a developmental depravity.  He describes Hitomi Hitoyoshi as his "first love" and is obsessively infatuated with her.  His inability to understand others results in him describing Zenkichi merely as a "boring guy" who should be completely dismissed for being ordinary.


 * As a negative person by nature who could kill a person just as easily as he could breathe, Kumagawa thinks nothing of the lives of the people around him and could take them away easily. Despite the immensely negative personality he possesses, he has a purely positive look regarding himself and has always been seen smiling. As a child, he was tested for any abnormalities, but was believed to be normal. It is now believed that his abnormality stems from his negative outlook, and on its own is far too great to be detected or measured. Ironically, he seems to have the ability to restore things to previous conditions, which does not seem to have any limitations. He is shown healing minor wounds, restoring ripped clothing, and even healing Maguro's surgery scars from before first year. He has also shown a second and unexplained ability to create illusions so convincing that people question whether or not they actually experienced them. It is unknown if all the abilities he has demonstrated have simply been Kumagawa influencing people's perceptions.  Because his ability, "All Fiction", can undo anything that has been damaged, he has no qualms about being destructive.  Kumagawa's weapon of choice seems to be many huge screws that appear in his hand.


 * Hansode Shiranui (不知火 半袖)
 * The comic relief character of the series, the granddaughter of the Headmaster of Hakoniwa Academy. Zenkichi regards her as his best friend; he is apparently the only person who can get along with her and somewhat control her.  Even though she is the smallest of the main characters, Shiranui has a very large appetite and is constantly seen eating. She has a knack for finding clandestine information with ease, knowing about most things that would seem to be vague details, and is unusually perceptive. Normally, she is a very cheerful girl but she is shown to have a dark side and is brutally tactless.  Shiranui harbors a hidden resentment against Medaka and claims she has no friends and, unlike the other abnormals, does not desire them.  Because of the antagonism that exists between them, Medaka initially asks Shiranui to become the Vice President of the Student Council, though Shiranui refuses.  While she prefers to remaining on the sidelines observing and removing herself from any danger, Shiranui elects to join Class -13 after encountering Kumagawa.


 * Mukae Emukae (江迎 怒江)
 * A transfer student to Hakoniwa Academy, whose ability "Raff-Rafflesia" causes all matter that comes into contact with her hands to decompose and corrode, including air. Like Misogi Kumasawa, she is always seen smiling and lacks any profound understanding of human relationships or any concern for the well-being of others.  As a result, her first encounter with Zenkichi results in her developing an obsessive infatuation with him that she interprets as love simply because he offered his hand to help her up.  After fighting Hitomi Hitoyoshi and corroding almost an entire building to escape, Kumagawa tells her to give up her obsession with Zenkichi in favour of himself.


 * Kagamaru Chougasaki (蝶ヶ崎蛾々丸)
 * A member of Class -13 who works together with Shibuki to stop Kumagawa from continuing his fight against Hinokage, Kagamaru is junior-level student with the ability "Encounter." He wears an elegant suit and a monocle and is well-informed of the events that ended the Flask Plan and recognizes who Hinokage is.


 * Shibuki Shibushi (志布志飛沫)
 * A member of Class -13 who works with Kagamaru to stop Kumagawa from continuing his fight against Hinokage. A freshman transfer student who enjoys fighting, her ability is known as "Dead Scar" and she dresses in a torn school uniform.

Other Students at Hakoniwa

 * Nekomi Nabeshima (鍋島 猫美)
 * A third year student and ex-captain of the judo team. Because she does not hesitate to cheat outside of official matches, Nabeshima is known as the "Queen of Fouls" in judo.  She despises natural geniuses, such as Akune, and has an interest in Zenkichi, wanting him to join the judo club and succeed her as the team's captain.  While her devised plot to rid the judo club of Akune and simultaneously have Zenkichi join the judo club fails, she still arranges for Medaka to accept Akune as the secretary of the Student Council and continues to express an interest in Zenkichi.  While she does not like admitting it, Nabeshima recognizes that she and Medaka are friends.  She has a tendency to avoid situations where she could lose or get badly hurt, so she is regarded as a coward, and is rarely fazed after situations where others are emotionally and mentally scarred.


 * Yakushima (屋久島)
 * The captain of the Swim Team, a third year student. As a swimmer, he is skilled in all areas of swimming, regardless of distance or style.  He regards his teammates, Tanegashima and Kikaijima, as family and neither Yakushima nor Tanegashima would hesitate to do anything to protect Kikaijima.  The three are obsessived with obtaining money, believing it is the most important thing of all; Yakushima's obsession comes from how his family split up due to not having money.  He is also a classmate of Nabeshima.


 * Tanegashima (種子島)
 * The vice-captain of the Swim Team, a second year student. Like Yakushima and Kikaijima, he is obsessed with obtaining money and believes it is more important than anything else.  His obsession stems from the orphanage that he had lived in being shutdown due to lack of funding and financial assistance.  However, he and his fellow Swim Club members regard each other like family.  A skilled swimmer, he is likely one of the fastest swimmers in the world.


 * Myouga Unzen (雲仙 冥加)
 * Myouri’s older sister, an odd girl who does not speak in any known language, instead she invented her own language of numbers that only Medaka and her brother Myouri can understand. Much like her brother she has a perverted personality, she likes telling jokes about breasts.  Myouga is introduced immediately after Myouri Unzen was defeated, she hoped to defeat Medaka so that she could steal her place in Class 13 from her. She would have been successful as well if Nekomi Nabeshima had not stepped in.  Her weapons of choice are six massive iron balls (each weighing 30kg or 66 lbs) each attached to chains. In her fight with Nabeshima she ditches these heavy balls and gains an incredible speed boost. Unfortunately for her that speed boost was not enough to defeat the “Queen of Fouls”


 * Kuudou Hinokage (日之影空洞)
 * The 97th Student Council President of Hakoniwa Academy and Medaka's immediate predescessor, who recommended Medaka as his successor as Student Council President, a friendly and jovial senior student at Hakoniwa Academy who has retired from the Student Council. He is regarded as a hero by Medaka and Zenkichi and Shiranui remarks that he is strong enough to take on an entire army on his own.  Almost no student can recall him, thus not allowing him to even be called "Mr. Unknown", and nobody can even recognize his existence, including Medaka.  Because of his extremely reclusive nature, he was able to protect the school for an entire year by himself, but was so overwhelmingly and abnormally strong, people were inclined to look away from him and forget his existence.  When Medaka approaches him for to aid the Student Council against Misogi, he refuses to work with her and challenges Misogi on his own in order to protect the school he loves.  Though he is initially able to hold his own, he realizes the true extent of Misogi's depravity and yields to Medaka's request when he learns that others like Misogi exist.

Others

 * Hakama Shiranui (不知火袴)
 * The Headmaster of Hakoniwa Academy and the grandfather of Hansode Shiranui, an elderly man who appears harmless but is actually ruthless and cunning. As the program manager of the Flask Plan, he fully intends to use the entire student population of Hakoniwa as experimental material to create the Perfect Human.  To this end, he attempts to manipulate Medaka and other students to achieve the ultimate result and then use the Hakoniwa students as guinea pigs to create more Perfect Humans.  When the Flask Plan is dismantled, he creates Class -13 as the successor to Class 13 and to oppose Medaka Kurokami's abilities without fully realizing the true extent of Misogi Kumasawa's power.


 * Maguro Kurokami (黒神 真黒)
 * Medaka and Naze's older brother, a perverted man who only cares about his two younger sisters; he loves them both obsessively, which neither sister is terribly fond of. The former supervisor of the Flask Plan, Maguro is known for his abnormal ability to analyze abnormalities and develop the most suitable methods to bring out the greatest potential of the individual; his ability gave him the project name "Magician."  His obsession with the Flask Plan resulted in his own voluntary removal of several organs, which eventually led to dropping out the Flask Plan when he was physically incapable of continuing his involvement.  While his original intention to become involved with Class 13 had been to find his missing sister Kujira, he became distracted by the incredible abnormality of Oudo Miyakonojou and was Oudo's original partner.  While he tends to insult Zenkichi and refuses to admit if he is worthy of Medaka, Maguro recognizes that Zenkichi has a positive influence on Medaka and wants him to remain by her side.


 * Hitomi Hitoyoshi (人吉瞳)
 * Zenkichi's mother, a doctor who studied and identified abnormalities in young children. Like her son, she is a caring individual and loves her son a great deal.  She is well-respected by Medaka and many others; Hitomi is effortlessly able to make Medaka dress more conservatively.  Having recognized the danger of Misogi Kumasawa, Hitomi has been tracking his movements since childhood, though has failed to stop him.  With Kumasawa's appearance at Hakoniwa, she enrolls as a student and enters Zenkichi's class, much to his embarrassment and dismay.  Hitomi resembles a twelve-year-old girl, which resulted in Akune initially mistaking her as Zenkichi's younger sister.  Despite her appearance, she is a master of Savate and adept with fighting with needles, marking pins, and surgical thread; she is surprisingly able to hold her own against Misogi Kumasawa.