Robert Haydn is the main antagonist in the 1st season of The Law of Ueki. He is a frightening and ruthless power user, with his power to make his ideals an reality. He nearly killed Ueki Kosuke in their first encounter by dropping him from a very high altitude but was then saved by Mr. K. He is also the leader of the Robert's Ten, which serves as his brawn. He is has a very tragic past which caused him to hate humanity but he later gave up his hatred after being touched by Ueki and his friends