Easlick
The roommate who lives in their room like it's their own personal heaven. If you try to pull them out, they'll scream at you like you're trying to steal their peace.
You: 'Hey, wanna eat?' Easlick: 'No. I'm in my room. I'm not coming out.'
You: 'Let's play video games!' Easlick: 'I'm not playing. I'm in my room. I'm not coming out.'
You: 'We're going out!' Easlick: 'I'm not going. I'm in my room. I'm not coming out.'