Your dialogue is definitely a strength, and always wonderful to read. I'm rather envious of it, actually. *envies and plots to steal the part of your brain devoted to writing*

Ah, the problem of Hogwarts professors - they're all too old, too ugly, too tiny, or a half-giant. Trelawney? Harry could have had a crush on Trelawney at one point, couldn't he? And then have his heart broken when Umbridge signs that dismissal...