This is... getting better, but I always thought Itsuki-chan designs tended to miss Itsuki's inherent fox-faced creepyness. Itsuki is just a bit threatening behind his blank smile, but Itsuki-chan always just seems like a bimbo.

Well, Itsuki's creepiness comes from the fact that he appears soft spoken and upbeat, but carries an aura of sinister motive. I always felt that the usual design for Itsuki (girl) had it translated into that Yakumo Yukari type of character who has one face that seems carefree and clueless hiding another that is savvy and calculating.