Carla wants people to know she exists, and she might have to tie a few shoelaces together or penny a door shut to force that moment of acknowledgement. If you don’t hate her, it’s because she hasn’t been trying hard enough. Her only known soft spot is for an obscure cartoon character from her childhood who she seems to have styled herself after. This might be why she’s usually on roller skates even in the hallways, or it might be because it annoys you. Or both.
Carla is in a single room, and so she doesn’t have a roommate.