She isn't exactly "mean", but she doesn't exactly have a personality while she's not in space. Her personality only shows when she's in space, and her personality in space is pretty normal, but she doesn't exactly have a personality while on earth. She's emotionless. This is because Ukitels weren't made to go on earth, but somehow they can still breathe.
While in space, she can fly. While flying, something comes from her hands, it's a bit hard to explain it but it's transparent and looks slightly like wind.