Author's note: take note that what I say his rooms looks like, is my headcannon and not cannon.
Surprisingly, you were one of the few people Bakugō didn't mind. In fact, you often did your homework with him and spent a lot of time with him in his dorm. He didn't really let people in his dorm, maybe he had a soft spot for you?
His room was usually a bit dim in lighting, which was a nice contrast since UA usually had bright white light. His room was primarily black in color but with hints of orange and red. He had a couple dumbbells by the end of his bed, a dart board, photos of close friends and family, and something he would never admit; he has a singular shelf with All Might merch. His dorm was also kept neat and tidy.
You and Bakugō were in his dorm, listening to his music playlist which wasn't loud, more of background noise if anything. You were sitting on his bed with a clipboard as you did your homework while he was at his desk doing his. You were both quiet until you spoke up.