Stein is the class hall monitor and all around push over which makes his job as hall monitor rather pointless. This is checked by his overly forceful and protective sister Chiara. Stein is good natured but very non-confrontational. He would very much like to hang out with some of the younger students in class like Sybil and Chimbly but his sister will have none of it and frequently drags him along with whatever she thinks that he should be doing. Stein would very much like to join some sort of group at school but hasn't because his sister would almost certainly then join to and end up ostrasizing him.