Balor

"You can't beat me. How many times do I have to repeat that? I already broke every bone in your body, you're bleeding internally, and the rest of your blood is gushing out your body. There's no point in continuing. I've won. I'm the King."

- Balor to a heavily beaten Amon Balor (バラー, Barā), also known as Evil Eye (悪目, Akume), is the current leader of the Fallen Army, having inherited the title directly from his father, Helel, shortly after surpassing him, becoming renown and feared as the new Demon King God (魔王神, Maōjin), who would rule the world after accomplishing what his father failed during the Dragon Civil War, killing the Grand Demon, as such, he desires to free the Four Archfiends before he can face the Grand Demon himself.

As of current time, Balor is believed to be the most powerful demon of the current generation, going as far as to even address himself as the Demiurge (デミウルゴス, Demiurugosu), a title reserved only for the most powerful of demons.

Trivia

 * In Irish mythology, Balor is a giant with a large eye on his forehead, that wreaks destruction when openned.