In addition to the Classical Dumbledore, the incipit of a piece in the Guardian suggests the new Harry Potter might be of interest to Classicists:

Everyone knows that the Harry Potter books have been getting darker. With an introductory epigraph from Aeschylus's The Libation Bearers ("Oh, the torment bred in the race/the grinding scream of death") there is no doubt that the seventh and last volume in the sequence will face us with darkness visible.

... are there more Classical quotes in the series?