Because you like Saruman in The Lord of the Rings

Born and raised in the darkness, Bane is determined to have the city totally under his control so that he can demolish it. See them in DC Extended Universe.

Buddy Pine is an unhinged superfan of superheroes using technology to take down his idols. See them in The Incredibles.

Tony Montana makes up for his language barrier with his immense skill at cursing as loud and effectively as humanly possible. See them in Scarface.

This cannibalistic villain may be a loner, but Killer Croc doesn't have problems with self-confidence. See them in Suicide Squad.

Boomerang is equally skilled at tossing boomerangs and tossing back beers. See them in DC Extended Universe.

There's more to this sweet, caring landlady than meets the eye. See them in Sherlock.

Though he may be blind, Chirrut Imwe sees the power of the force more than most. See them in Rogue One.

One of the best in the magical world, Mad-Eye has the battle scars to prove his dedication to such a dangerous job. See them in Harry Potter Series.

His name is Inigo Montoya and whoever killed his father should be prepared to die. See them in The Princess Bride.

Hank McCoy is a quintessential nerdy scientist but with a few rather unconventional physical attributes. See them in X-Men Series.