Because you like Saruman in The Lord of the Rings
Both a noble district attorney and a psychopathic villain, Harvey Dent proves some men really can have it all. See them in DC Extended Universe.
Cyclops shoots lasers out of his eyes, destroying anything in his line of sight. See them in X-Men Series.
Peter Venkman's "research" projects are designed to get undergraduate students to sleep with him. Though it turns out he can bust ghosts. See them in Ghostbusters.
Khan Noonien Singh is super strong, super smart, and out for revenge. He always seems to be two steps ahead of his enemies. See them in Star Trek Into Darkness.
Waylon Smithers would do anything for his boss, and would love to do a few things *to* him. See them in The Simpsons.
A cursed pirate captain, Barbossa is greedy, vengeful, and surprisingly cheeky. See them in Pirates of the Caribbean: the Curse of the Black Pearl.
Honest, true, and just, Ned Stark is a good man. Unfortunately, those traits are not assets in Westerosi politics. See them in Game of Thrones.
A majestic ruler, Mufasa is respected throughout the animal kingdom. See them in The Lion King.
Relentlessly cheery Ned Flanders enjoys a nice piece of bread with water on the side for dipping See them in The Simpsons.
In his heart, this student rebel is more of a lover than a fighter. See them in Les Miserables.