Severus Snape from Harry Potter
Severus Snape appears as a villain in Harry Potter and the Sorcerer’s Stone and continues to appear as one for the following five and a half books or six and a half movies, depending on your preferred method of Harry Potter obsession. He constantly clashes with Harry, Ron, and Hermoine during their years at Hogwarts and as the series progresses, so do his apparent evil tendencies. Snape even takes the Unbreakable Vow, promosing at the cost of death to aid Draco Malfoy in his mission as a Death Eater and to kill Dumbledore should Draco fail. We learn the truth once and for all about Snape just after he is killed when Harry watches his memories in the pensieve. Snape had been in love with Harry’s mother, Lily, and had been looking after him throughout his years at Hogwarts. While Dumbledore had been watching Harry to make sure that he would die at the proper moment, Snape had been doing it out of his true love for Lily. "Always."