Because you like The Doctor in Star Trek Voyager

A suave demon, Crowley grants humans their wishes in exchange for their soul, only to find loopholes that benefit him. See them in Supernatural.

Point the fun-loving Pippin Took towards second breakfast, and he's one happy hobbit. See them in The Lord of the Rings.

Macbeth was probably named "Most Likely to Kill His Rivals" in his senior yearbook. See them in Macbeth.

Green skin, pointy hat, evil cackle—this villain has it all! See them in The Wizard of Oz.

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.

Relentlessly cheerful and optimistic, Erin Hannon is an office receptionist. See them in The Office.

A determined and cold-hearted spy, Cassian Andor will do what it takes to stand up to the evil Galatic Empire. See them in Rogue One.

Jorah Mormont is loyal to his queen. And he's quite in love with her as well. See them in Game of Thrones.

Taystee Jefferson is always down for a laugh and to help a friend out. See them in Orange Is The New Black.

Dutiful, composed, and aloof, Sun Bak is the fighting force behind her team of eight "sensates" who are telepathically linked. See them in Sense8.

Winn Schott is just your friendly neighborhood superhero support system. See them in Supergirl.

Artemis Fowl understands the way of the world. If he wins, he's a prodigy. If he loses, then he's crazy. That is how history is written. See them in Artemis Fowl.