Dobby of Dormitory

Busybody student who oversees the maintenance of sanitation in dorm thus often gets deployed by fellow students in cleaning activities as a trump card.

Sally: Oh no, I'll be punished because my room is a total mess. What should I do?!
Julia: Ask Bianka to help you. She lets you mop the floor and scour the toilet with her hair!!
Bianka: That's right because I'm the Dobby of Dormitory after all.