Shan-Yu

Mulan (1998)
This is about the scariest villain of them all. He has no humor to him whatsoever. We often see the villains in their hideout with a sidekick and a lot of humor. Not so with this guy. We don't know why he does what he does; we don't know his motive. We only know that he is violent, ruthless, and determined. Even an adult seeing this movie, would be a bit afraid of this guy.