A lead artist for the KENIX circle, alongside artist Wan-Pyo, on the E-KENIX website. Creates original art, fan art, and doujinshi. Character designer for some games, not credited under the name "Nin Nin!".

TIMELINE:
1996 - Kuru Kuru Twinkle (くるくるトゥインクル) | PlayStation 1 | TOMY / TOMCAT SYSTEM [1]
1997 - Ridegear Guybrave (雷弩機兵ガイブレイブ) | PlayStation 1 | AXELA [2]
1998 - E-KENIX NIN NIN! & Wan-Pyo "ＫＥＮＩＸ" webpage: http://www.netlaputa.ne.jp/%7Ekenix/
1998 - Ridegear Guybrave 2 (雷弩機兵ガイブレイブ２) | PlayStation 1 | AXELA [3]
2000 - Shiranui_Mai's Room ＫＥＮＩＸ Nin Nin! ・Wan-Pyo : http://www.ax.sakura.ne.jp/~kenix/mai-room/index.html
2000 - RPG Maker 2000 (RPGツクール2000) | Windows | Digital Famitsu [4]
2002 - content in "netlaputa" transfer for → "ax.sakura"
2006 - Blog (Nin Nin!): http://ninxnin.blog67.fc2.com/
2008 - E-KENIX / Nin Nin!: http://ekenix.web.fc2.com/kenix/index00.html

NOTES:
[1] (STAFF) Character Design: Ken Kasahara (笠原 健)
[2] (STAFF) Character Design: Ken Kasahara (笠原 健); Shigehiro Yamashita (山下 滋宏); Masao Shiroto (白戸 政男)
[3] (STAFF) Character Design: Ken Kasahara (笠原 健); Motomi Kaziwara (梶原基充)*; D-SATO; Wan-Pyo (王彪); Emiko Sakuma (佐久間 恵美子); Masao Shiroto (白戸 政男)
[4] (STAFF) Sample Graphics: Norikazu Masaki (正木範和); Ken Kasahara (笠原 健); Wan-Pyo (王彪); Oko; Shigezou (シゲゾー); Motomitsu Kajiwara (梶原基充)*; Satoshi Yamagishi (山岸悟史)
* 梶原基充 in manual, Motomi Kaziwara during the rolling of the credits and Motomitsu Kajiwara (MobyGames)

PS:
Some users believe the artist "Nin Nin!" worked on other games under a different name or alias due to their art style, such as the backgrounds arts displayed during the save menu in the game "Shiren the Wanderer: The Tower of Fortune and the Dice of Fate" (2010).