You're right, she's had very little screentime, but in that screentime, she's talked to Alto and discussed shit with him while smiling (which is obviously a positive). Then she got embarrased when Michel talked about her loli form and slapped him for being an asshole. Those are the only major things I can remember.
From the little we know of her personality, there's nothing bad about it. You're just jealous she has bigger titties then Sheryl. And no, scaling doesn't change anything.