Snape's Anniversary Patronus

Severus Snape proves that being Slytherin doesn't make you a villain. The connection this character has with the Potters make it one of the biggest turning point in the Harry Potter story. His Patronus helps Harry find his way. His memories also make it clear for what Harry has to do. Sadly the actor of Snape, Alan Rickman passed away 5 years ago to pancreatic cancer. So I believe this Harry Potter 20th Anniversary entry is more of a Severus Snape 20th Anniversary entry.