Arqua

Arqua is a character in the Dragon Ball franchise. He makes his debut (and ultimately, his only major appearance) in "Water Fight", the 197th episode of Dragon Ball Z, which premiered on August 18, 1993. He is seen again in a cameo in the movie Dragon Ball Z: Fusion Reborn.
Arqua is East Kai's prodigy student. He is matched against Goku in the third round of the Other World Tournament, where he is met with a rough start. Shortly into the match, Arqua transforms the arena into a water environment, giving him somewhat of an advantage in the battle. However with his strategy combining the Solar Flare and Kamehameha techniques, Goku is able to launch Arqua out of the ring and emerge victorious.
After his defeat, Arqua is scolded by East Kai for allegedly ruining her reputation, and is ordered to run 1000 laps around Grand Kai's mansion. Goku confesses he is impressed with Arqua's abilities (as opposed to his previous opponent) and proposes they one day have a rematch, imposing some joy in the usually melancholy Arqua, until East Kai yells at him once again.

In the movie Dragon Ball Z: Fusion Reborn, Pikkon easily defeats him in the semifinals of the 2nd Other World Tournament.



Information from:
http://dragonball.wikia.com/