"Remus Lupin was one of my favorite characters in the entire Potter series. I made myself cry all over again while writing this entry, because I hated killing him.
Lupin’s condition of lycanthropy (being a werewolf) was a metaphor for those illnesses that carry a stigma, like HIV and AIDS. All kinds of superstitions seem to surround blood-borne conditions, probably due to taboos surrounding blood itself. The wizarding community is as prone to hysteria and prejudice as the Muggle one, and the character of Lupin gave me a chance to examine those attitudes.
Remus’s Patronus is never revealed in the Potter books, even though it is he who teaches Harry the difficult and unusual art of producing one. It is, in fact, a wolf - an ordinary wold, not a werewolf. Wolves are family-orientated and non-aggressive, but Remus dislikes the form of his Patronus, which is a constant reminder of his affliction. Everything wolfish disgusts him, and he often produces a non-corporeal Patronus deliberately, especially when others are watching."