One of many evil villains on the series and most common to show up. He is the leader of his own group but refuse to team up with anyone. Any time a Unknown refuse to understand, obey, or attack Dark will not hassle to fight. On a closer look his eyes are dark with dark mess around it, unlike any of the other characters he has a robe that nearly covers him whole. He knows why he must fight and at the same time not want humans to be involved.
Dark unknown power remains a mystery, he can summon monsters but can't undo other unknowns powers, hits very powerful, and fly. Its believed that he knows his powers but waits for the right time to unleash them.