Mebachi

Evening student at Garasunomiya. Strange and energetic girl who always acts like comedic duo with her friend Guppy who is also evening student. She always cares about Guppy and even voluntarily nominates herself as monitor to go to Saru's all-boys school for preliminary investigation before the decision of schools merging.

Spoiler

She has a multiple personalities disorder caused by her trauma in the past. Her other self is called Big Eye, which is actually her mother. She actually had met Saruyoshi in the past and often fight with him.

Full name: Kitano Mebachi