Keiko Ijuu (伊集 桂子, Ijuu Keiko) is a game designer and one of the main people involved in the development team of the Goketsuji Ichizoku series, sometimes being credited as Chuuko in Power Instinct to Power Instinct Legends and Cheiko in the vocalist list from Matrimelee and Bonnou no Kaihou.
Her roles in the development come in character design, planner, producer and even vocalist of the theme songs, she performed Annie's theme song in Power Instinct 2 and Power Instinct Legends and she is listed as one of the vocalists in Goketsuji Ichizoku Matsuri Senzo Kuyou , but it is not specified which of the songs she performed, but since there are just two songs performed by females, most probably she repeated her interpretation of the song Hajimete no Ai.
Also in the Soundtrack From Bonnou no Kaiho, she is listed as the performer of theme Shinobi Ai Goketsuji meaning that she voiced the fictional singer Kei, the soundtrack also credits her as one of the three singers performing the theme Tokimeki Overclock being the other two singers Momoeika and Piko.This leaves unclear if the vocalist names on the credits from Power Instnct Matrimelee (Uchida, Nami Matusima & Aya fujimoto) are mean to be the names of the Akihabara Sannin Musume or if there was a change on the real vocalists in the version of the song for Bonnou no Kaiho.
Goketsuji Ichizoku Matsuri Senzo Kuyou (2009): Producer/ Vocalist
Metal Slug (2008): Producer
KOF: Maximum Impact Regulation "A": Director of Development
Ontamarama (2007): Producer
Metal Slug (2006) : Producer
Shin Gōketsuji Ichizoku: Bonnō no Kaihou (2006): Producer
KOF: Maximum Impact (2004) Director of Development
Shin Gōketsuji Ichizoku Tōkon: Matrimelee (2003) Producer
Metal Slug 4 (2002):Producer
Sengoku 3 (2001): Producer
Gaia Crusaders (1999): Product Management/Producer)
Princess Crown (1997): Project Management
Purikura Daisakusen (1996): Director
Shin Gōketsuji Ichizoku Tōkon Matrimelee (2003): Director
Sengoku 3 : Planner
Gaia Crusaders : Background Designer
Goketsuji Ichizoku(1993): Character Designer, Voice Acting, Sub-producer