I laught when much of point showed on Tae, no i dont she is crazy or something -i hope she will have somehow good brain as other member. Its possible i think, because the other have same conditions to before.
Tae, Sakura and Saki are the most memorable ones for now in my opinion. Junko and Ai have their moments but they're not really my type... I'm gonna go with Tae because well, she IS the legendary Yamada Tae.