Kuroha's a magician with some seriously destructive powers—she can obliterate inanimate objects with ease, and when she makes direct contact with living things, she can transfer her power to them. Her abilities are so intense that she had to go through a bunch of grueling tests while in the lab, which ended up damaging her memory pretty badly. She's lost almost all of her childhood memories now, though she still has vague emotional fragments floating around.
Most of the time she's pretty gentle and caring, but she's got a short fuse when she's embarrassed. The thing that really sets her off is watching Murakami get close to other girls—especially when Kazumi starts flirting with him. When that happens, she unconsciously destroys stuff around her with her magic. She's honestly confused by her own reactions to it.
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