Naturally, Nadine finds a reliable mentor figure in her history teacher, though it's safe to say no actor has ever put quite the dyspeptic spin on this cliché that Woody Harrelson manages here. (latimes.com)
As for who the rest of the cast will play, your guess is as good as ours, although we do know Harrelson will portray some kind of mentor figure to Han. (space.ca)
Dumbledore (Michael Gambon), the wise mentor figure, has a double, his brother Aberforth (Ciarán Hinds), who insists that Voldemort has won the war, and the sibling further hints at the possibility that perhaps his brother and Harry's most important teacher was not the pure figure of the young man's recollection. (markreviewsmovies.com)