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 Chevaliers. 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 fierce loyalty towards his teammates when he stood with Onyxx and Flubber in a possible coup against Gambit when they believed him to be taking advantage of newcomer Foxx. However, they were easily set straight, although later Foxx turned out to be one of Mystique's disguises. Rain Boy helped to try and calm Onyxx when the latter freaked out upon learning of this information.
Rain Boy was presumed to have been de-powered on M-Day when the majority of mutants lost their powers. Many de-powered students were murdered by William Stryker, but Rain Boy's fate was not explicitly shown.
On the night of the Hellfire Gala, they found Scout dead while exploring Planet Arakko. Deciding they couldn't trust the adults after their recent secretive and unhelpful behavior and not wanting to get Farouk caught up in something he'd probably get blamed for, they decided to get Gabby resurrected themselves by going to Arbor Magna and using Cerebro to put a copy of her mind back into her body (which was being controlled by No-Girl.) When they got there No-Girl tried to mind control Tempus but they were confronted by Wolfsbane in wolf form.
Powers and Abilities
Living water held in a containment suit, able to expel his liquid mass as pressurized streams from his hands.