A person who you better not to bring any problems to. If you'll still do it, then she can find a really unpredictable way to solve your problem (or to outwit you). And if you'll make her mad, then it would be even worse. But the problem is to make her your friend, because she is tsundere and won't even say a hello to you. But if you'll manage it at least on a small level, then you may have a really smart ally.