Atlantis

Atlantis was an Archerfish-like choujin who had mental control over liquid and became stronger when he fought underwater. He first fought Robin Mask and gained the upper hand, killing his opponent when he lured Robin underwater by throwing Meat’s body part into the lake on which the ring floated. He did a number on Kinnikuman as well, but ultimately Kin defeated him. He was one of the choujin to escape from Hell and be retrieved by The Omegaman.