Teppei Koike (小池 徹平, Koike Teppei?, born January 5, 1986) is an actor and singer from Japan. His nicknames are Teppei-chan, Teppei-kun, KoiQ, and Te-chan. He was born in Osakasayama, Osaka Prefecture. His blood type is B. He belongs to the production company Burning Productions and is a member of the singer-songwriter duo WaT with his partner, Eiji Wentz.
* Attended Osaka Furitsu Nagano High School.
* Was the grand prix winner of the 14th Junon Super Boy Contest.
* Moved to Tokyo in the spring. Changed schools to Horikoshi High (also attended at the same time by NEWS' Tomohisa Yamashita, D-BOYS' Yuu Shirota, Japanese actor and singer Toma Ikuta and KAT-TUN's Koki Tanaka)
* Met Eiji Wentz while working and formed WaT. Started doing street lives.
* Debuted as an actor in the drama Tentai Kazoku.
* WaT released debut indies CD Sotsugyō Time in June.
* Acted in the drama Gokusen 2, which was part of the reason for his increasing popularity.
* WaT signs with Universal Music in August, releases first major single Boku no Kimochi in November, reaching 2nd place on the Oricon chart. They are the band with the shortest time gap between debut and appearing on NHK's Kōhaku Uta Gassen.
* Released his first photobook, First Letter From Teppei.
* Presented with the Newcomer's 43rd Golden Arrow Award (WaT).
* Presented with the 20th Gold Disc Award for "Best New Artist".
* First leading role in the movie Lovely Complex as Atsushi Otani.
* Official supporter in 2006's International Volleyball Tournament (WaT).
* Nominated for the Best Supporting Actor in the 49th Drama Academy Award, for his performance in Iryu.
* Released his second photobook, Kiss me, Kiss me.
* On New Year's Eve, WaT performed for the second time in NHK's Kōhaku.
* Acted in the drama Iryu, as Ijyuuin.
* First music solo project was announced on January 10.
* His story of leaving his family and hometown to pursue his dream to be a performer was turned into a 52 pages one shot manga entitled Bokura no Ibasho by Nakahara Aya, the author of the manga Lovely Complex.
* Solo single, Kimi ni Okuru Uta, was released on February 14, Valentine's Day, with Wentz's solo song Lucky de Happy as the B-side song.
* Solo album, Pieces was released on the 27th of June.
Tentai Kazoku (2002)
Anata no Jinsei Ohakobishimasu (2003)
Okaasan to Isshou (2003)
Yankee Bokou ni Kaeru (2003)
Houkago - Kaname Komiya (2004)
Water Boys 2 - Iwata Iwao (2005)
Gokusen 2 - Takeda Keita (2005)
Dragon Zakura - Ogata Hideki (2005)
Oniyome Nikki - Sawamura Ryousuke (2005)
Iryu - Ijuuin Noboru (2006)
Iryu 2 - Ijuuin Noboru (2007)
Shibatora - Shibata Taketora (2008)