Tadashi Agi

Tadashi Agi (亜樹 直 Agi Tadashi) is a Japanese manga storywriter, novelist and screenwriter. His original name is Shin Kibayashi (樹林 伸 Kibayashi Shin). He was born in 1962 in Tokyo, and graduated from Tokyo Metropolitan Musashi Senior High School and Waseda University School of Economics & Political Science. The penname "Tadashi Agi" is shared with his sister. Under the name Yuma Ando, he received the 2003 Kodansha Manga Award for shōnen for writing Kunimitsu no Matsuri.

Pennames
Besides the main pen-name of "Tadashi Agi", Shin Kibayashi also goes by other pennames:
 * Seimaru Amagi (天樹征丸 Amagi Seimaru)
 * Yuya Aoki (青樹佑夜 Aoki Yūya)
 * Yuma Ando (安童夕馬 Ando Yuma)
 * Jōji Arimori (有森丈時 Arimori Jōji)
 * Hiroaki Igano (伊賀大晃 Igano Hiroaki)
 * S.K

As Seimaru Amagi

 * Kindaichi Shōnen no Jikenbo (金田一少年の事件簿) (1992— Kodansha), original idea; English translation: Kindaichi Case Files (2004–2008 Tokyopop)
 * Detective School Q (探偵学園Q) (2001–2005 Kodansha)
 * Rimōto (リモート) (2002–2004 Kodansha); English translation: Remote (2004–2006 Tokyopop)

As Yuma Ando

 * Tokyo Eighties (????)
 * Psychometrer Eiji (サイコメトラーEIJI) (1996–2000 Kodansha)
 * Kunimitsu no Matsuri (クニミツの政) (2001–2005 Kodansha)
 * Shibatora (シバトラ) (2006–2009 Kodansha)

As Yuya Aoki

 * Gettobakkāzu Dakkan'ya (ゲットバッカーズ -奪還屋-) (1999–2007 Kodansha); English translation: GetBackers (2004–2008 Tokyopop)
 * Saiko Basutāzu (サイコバスターズ) (2003 Kodansha); English translation: Psycho Busters (2008–2009 Del Rey Manga)

As Jōji Arimori

 * Snow Dolphin (????)
 * Asobot Military History Goku (アソボット戦記五九) (2001–2002 Kodansha)

As Ryō Ryūmon

 * Buraddi Mandei (ブラッディ・マンデイ) (2007 – 2009 Kodansha); English translation: Bloody Monday (Chuang Yi)

As Hiroaki Igano

 * The Knight of the Area (エリアの騎士) (2006— Kodansha)

As Tadashi Agi

 * Gakkou no kowai uwasa
 * Kami no Shizuku
 * Psycho Doctor
 * Psycho Doctor Kai Kyousuke