Suzume lives on the same floor of the dorms, I think. This would totally magnify her 'EVERYONE IS FAMILY' attitude by like a million, as long as he didn't actively try to offend her he'd find himself being offered dinner whenever she cooks a lot or cookies after a baking day. And she would constantly try to let him borrow a hairbrush.
As far as fighting goes, Suzume can be a somewhat scrappy type herself if her 'family' are involved, though she's not really known for it within the school. Since he's not a bully she wouldn't pick a fight with him directly but if she saw him fight she'd probably end up bugging him about 'that was cool how did you do that' or 'can I practice against you'? She's not really a practiced fighter, though, so she probably couldn't beat him.
I mentionned the history stuff in my own thing but. Suzume can totally respect being that interested in a topic (she honesly wishes she had something she was that knowledgeable about/interested in.) and would be intetrested in being talked at about history as long as he was enthuseastic enough about discussing it.