An interesting fact about Severus Snape is that he’s one of the few characters in the Harry Potter series whose Patronus changes to match someone he loved. Snape’s Patronus is a doe, the same as Lily Potter’s, symbolizing that his love for her remained unchanged from childhood until his death. This is extremely rare in the wizarding world and is used by J.K. Rowling to quietly reveal Snape’s true motivations long before they’re fully explained. It’s also a subtle mirror to James Potter’s Patronu