She creeped me out after DH. Lol. It was the painting portraits of all her Gryffindor friends on the ceiling over her bed that did it. In canon, she really doesn't spend a LOT of time with them; I can see her thinking of them as friends, but not the sort that you'd, you know, paint over your bed. I don't think I'd even want my best friend's portrait painted over my bed. It was supposed to be endearing, I think, but it totally creeped me out. Between that and her calm assertion that no one really knows what's going on around them except her (which it seemed that Jo again intended to be endearing, but always made me think that she had a very loose grip on reality at best), I can see where she could justify doing something wrong just because she doesn't seem to ever think she's wrong--whatever idea pops into her head, she seems to accept as complete truth. *shrug* But that's just my take on Luna. Lol. Far from the popular view, I'd imagine.