The disguise of [[Ranma-chan]] when she acts as [[Hibiki Ryouga]]'s little sister. 
(Actually this isn't always the case. Sometimes the Yoiko Hibiki depicted in fanart isn't Ranma-chan, but really is a "real" Yoiko Hibiki.)

* Reference
** [[Ranma-chan]]
** [[Saotome Ranma]]
hibiki yoiko