I find Rin from Idolm@ster: Cinderella Girls used as an OC all the time. It's annoying.

Doesn't anyone know her??

I mean, rarely anyone knows her.

Please, Rin-chan is a great person! Don't make her feel forgotten! ;-;

I find it annoying, and yet I made an exception when Rozero-san made me a cover with Rin on it... =~=