Snape's love for Lily is often considered obsessive and problematic, but there are hints in Harry Potter that his feelings have been misrepresented.

You have your mother’s eyes,” a dying Severus Snape (Alan Rickman) tells Harry Potter (Daniel Radcliffe) in 2011’s Harry ...

However, Snape isn't the only villainous character in the series that uses a Patronus. Dolores Umbridge also casts a Patronus (in the form of a cat) during "Harry Potter and the Deathly Hallows." ...

Harry (Daniel Radcliffe), Ron (Rupert Grint ... the magical items responsible for his immortality. But as the mystical Deathly Hallows are uncovered, and Voldemort finds out about their mission ...