Rei

Rei, the leader of the Council of Hatred is a young man with bad intentions.

He's more successful in controlling and commanding others when he's using his words, other than force. He prefers to let his followers do the dirtier work and get caught rather than himself.

Since his younger years, Rei has never liked the existence of Elemental Masters. He believes that they're unnatural, super freakish beings that shouldn't even exist. Rei thinks nature is better than humanity, and the two shouldn't correlate. Which is why his mission is to get rid of them.

Of course, he can't do it alone. He needs the Council.