The problem with having an omnipotent but untrained character is that they are here to get training. And once that training happens and they begin to access their capabilities, they become completely game-breaking. Sure, comics have powerful characters, but this is not a comic. It's a roleplaying game, and a good game requires balance. And when an theoretically omnipotent character reaches their potential, that balance and then the whole game gets shattered.

With his current abilities (flight, memory, absorbing radiation, energy beams, regeneration and robotic strength), that's already a very powerful character. Perhaps that should be the limit of his abilities, and could just get more skilled with those?