Tim Roth almost played Severus Snape in the "Harry Potter" movies. He turned down the role to act in Tim Burton’s “Planet of the Apes.” Whoops!
1
He was possibly the only Death Eater to conjure a Patronus. According to Wizarding World, a Patronus is generated through "memories of happiness and hope." Because of this, there are few dark wizards who can conjure them.
2
Snape pretty much fits the description of a Potions Master to a T. From the Wizarding World: "The popular idea of a Potions expert within the wizarding community is of a brooding, slow-burning personality."
3
His father was a muggle. His father was neglectful and sometimes abusive, which may have contributed to Snape's disdain for Muggles. At some point during his school years, he decided to reject his father's name entirely, giving himself the moniker "The Half-Blood Prince" with his mother's maiden name instead.
4
Snape's family lived on Spinner's End, which is shown as a run-down street in "Harry Potter and the Half-Blood Prince," insinuating that Snape's family wasn't very wealthy, another factor in his difficult upbringing.
5
Snape may have ended his relationship with Lily Evans by calling her an offensive name. While being bullied by James Potter and his friends, Lily came to his defense. Instead of accepting her act of kindness, he rejected her and called her a "mudblood" — an insult to witches and wizards with Muggle parents — despite his own impure bloodline.
6
Snape taught Potions partly because J.K. Rowling hated chemistry.
7
Snape was one of Slughorn's favorite students when he was at Hogwarts.
8
His final words differ in the final movie compared to the book. In the film, as Harry is holding a dying Snape in his arms, the professor uses his final words to repeat a line we've heard from several other characters throughout the series: "You have your mother's eyes." The book, however, is a bit more subtle. He simply says "Look... at... me..." presumably, so he could see Lily's eyes one last time.
9
He's neither all good nor all bad. Rowling described him in one 2015 tweet as "grey," with both saint-like and devil-like tendencies.
10
Snape evidently smells like bitterness and old shoes. That was how Rowling described him after a fan asked on Twitter.
11
Rita Skeeter probably wrote a tell-all about Snape. Rowling joked that Skeeter would probably have gone on to write a biography titled "Snape: Scoundrel or Saint?" after the character's death.