Kousuke Ueki

Ability: Change trash into trees Ability Level 2: Undo the opponent's power

Kousuke Ueki is the main character in the series. He is in Class 1-C at Hinokuni Junior High School. Ueki's ability is given to him by Kobayashi (a.k.a. Mr. K), who is also Ueki's homeroom teacher. His level 2 power is to undo the opponent's power. He can use more than one sacred treasure weapon at the same time because of his given ability.

Ueki is a genuinely kind person who is always trying to help people out. He is an unusually calm individual, and doesn't care about what happens to him. He can be found snoozing in class, letting children use him as a target for shooting soccer balls (or in one case, a surfboard) and also calling the police without panicking when he faces a gang of rowdy teenagers. He cares for people around him, even going as far as saving Robert Haydn from falling debris in the Dogura Mansion. He is a bit of a simpleton who constantly uses his ability against non-gifted, but that is because he just can't stand seeing these nasty folks defying his sense of justice.

Even though he constantly loses his talents (and gains fairly useless ones when he wins), he believes that he can still make do by putting even more effort into succeeding. Ueki is actually a heavenly being sent to Earth by his father in order to take part in this tournament. Being a heavenly being allows him powers beyond his tree-making skills. He is still training in the use of these powers.