Remus Lupin

If Fenrir Greyback has been played,
Lupin transforms into a Werewolf
Professor Remus John Lupin, O.M.
(First Class),also known as Moony, was a
half-blood wizard and the only son of Lyall
and Hope Lupin. He was afflicted with lycanthropy
during his childhood, as a result of Fenrir Greyback's
revenge against Lyall.