Fuka Honjou

Fūka is a strong girl in the same class as Mei, and is also his roommate. Fūka is a member of the public morals committee and often intervenes when the student council president Seira Rindō is performing various perverted acts with other females students, or with Mei. Along with this, she takes part in night patrols around the school's dormitory which can keep her out late. To help in her struggle with the unruly, she carries a wooden sword and has been known to knock doors completely off their hinges when using it. After Mei is found out to be a boy, she tells him not to worry how they are roommates which makes Mei very happy. Fūka worries about Mei's well-being and feels the need to protect him. She has expressed an overactive imagination in regards to Mei.(Wikipedia)