Yourou Tsumugu

The janitor of Chouji's school. She always wears her maid outfit, and often carries around her customized broom (as in customized to be a real lethal gun weapon) with her. She was known to always wear her poker face and never let out a single emotion before,

Spoiler

but one day, Chouji helped her when she injured her leg, and then he offered her to move in and start living in his house

. Now, she's staying in a dog house in Chouji's garden rather than living at school where she used to live before.

Spoiler

Her personality became warmer and more outgoing ever since she started living there. She never completed her schooling due to her circumstances and therefore can be found sitting outside of classrooms listening in on the lectures often.