I believe this is the new idol, Anzu Futaba, that is featured in the mobile harem game for Idolm@sters. Should it be marked as Idolm@sters as well?
-Edit: Source- http://seventhstyle.com/2012/02/05/messy-loli-character-becomes-an-idol/
-Edit: Source- http://seventhstyle.com/2012/02/05/messy-loli-character-becomes-an-idol/