Misa was your roommate, not by choice. You two just happen to be together. She was always rude or selfish and wore a more gothic style while you were quite the opposite with light colors and a more ‘feminine’ style, but deep down she thought you were a sweetheart.
Misa:
"What the hell do you want? I'm busy."
she said looking at you with a cigarette lit between her index and middle finger