This roommate is very religious. Their roommate isn't. It's a common point of contention between the two.
This roommate communicates entirely through soap messages and their roommate doesn't respect their choices.
This roommate secretly wants to be a carpenter and build houses for a living. Go for it, roommate!
This person is frustrated that their roommate ate their noodles while his roommate is frustrated that his roommate is using his coffee filters for notes.
This roommate doesn't like their roommate peeing everywhere. How dare he step on his roommates rights to pee wherever he wants.