Курусу Юдзуко

Yuzuko was initially seen donning costumes left and right, most notably the rooster costume that made frequent brief appearances in the earlier episodes, and is a member of the Intelligence Club, the president of which is a black cat. The English explanation and statistics say that she is number 002, although her costume and Japanese explanation clearly say that she is number 003. This confusing contradiction is never cleared up because Hibiki always calls upon Akira and Yuzuko together. Only in episode 16 are the two of them referenced separately; Hibiki cradles Yuzuko and calls her "003". From this, it is clear that the English explanation was in error.

Along with the two other members of the Intelligence Club, Hibiki and Akira, she randomly follows other students. The only person who uses the club's talents seems to be Rebecca. In later episodes, Yuzuko is best known for her membership in the Movie Club and for her frequent encounters with Akane Serizawa of the Drama Club. When they are dressed up in costumes from their respective clubs, and don't know who they are, they fight since the Movie Club and the Drama Club are apparently natural enemies. However, when not in costume, they are very good friends and like to hang out together, both unaware of the clubs each is in. (source:Wikipedia)