She complains if someone is using the bathroom too long. She complains about the lack of some hair product she's used to... She actually complains quite a bit.

[Nari herself will settle down on the bed, grabbing one of the blankets and tossing it at Junpei. The other she wraps around herself like a fluffy cocoon.]

No, she doesn't. She's so sweet and kind, and honestly, I'm happy she's my roommate.