Origin and history
Rain Boy was a member of Gambit's training squad at the Xavier Institute for Higher Learning.
Rain Boy’s past before he came to the Xavier Institute is unknown, but when he arrived at the school, he was placed on Gambit’s student squad. Seemingly the youngest member of the team, he seemed to fall into that place, notably a bit shyer and naïve than the others. However, he also showed a good knowledge of the workings of the X-Men, and also some fierce loyalty towards his teammates when he stood with Onyxx and Flubber in a possible coup against their trainer, Gambit, when they believed him to be taking advantage of newcomer Foxx, however, they were easily set straight. Later, Foxx turned out to be one of Mystique's disguises, and Rain Boy helped to try and calm Onyxx when he freaked when he learned of this.
He was presumably depowered on M-Day as he was not seen with his classmates during Emma Frost's student brawl. However, his status after the mutant decimation has yet to be officially confirmed.
Powers and abilities
Rain Boy is a mutant whose body is completely composed of living water held in a containment suit. He could expel his liquid mass as pressurized concussive streams of water from his body but mostly used his hands.