Emperor Belos: Religious

Micah Bell: Yeehaw

Dimentio: Jester

High Evolutionary: Controlling

Scar: Lazy

All For One: Childish

Albert Wesker: Traitor

I can do this all day.

Ghidorah (Monsterverse): Kevin

Ganondorf (Tears of the Kingdom): Dilf

Patrick Bateman: Sigma /j

Bendy (Ink Demon): Ink

Syndrome: Petty

Patrick is sigma indeed

Palpatine: Wrinkly

Kenjaku: MythBuster

Shift & Pope: Monkey

AM: Misanthropic

Dio Brando: Egotistical

J. Geil: Bald

Future Zamasu: “Righteous”

Bill Cipher: Prankster

Archibald Snatcher: Cheesy

I am gonna mention the ones I last saw

General Aguila: Power-Hungry (idk if this counts since it's two words into one)

Mad-Man: Murderous

Doflamingo: Fabulous

Apocalypse (90's X-MEN/Spider-Man Cartoon Continuity): Slaver

Unalaq: Wasted