Franklin Richards

Franklin Richards is a hero from Marvel comics, most associated with the Fantastic Four, he is the son of Invisible Woman and Mr. Fantastic but due to exposure from cosmic radiation while in the womb was born a mutant with unimaginable reality-warping abilities.

Franklin is considered the most powerful mutant in all of Marvel comics, with some rare exceptions (such as the villainous Marquis of Death) - as an adult Franklin was shown to have enough power to make Galactus into his personal Herald and even as a child Franklin has sufficient power to create pocket universes and is at least as powerful as a Celestial.

Despite all his powers Franklin is still a child and thus mostly wishes to have fun, learn and be with his friends and family - as an adult Franklin is shown to have become an immensely successful cosmic-tier hero who guards the entire multiverse and easily ranks as one of Marvel's most powerful heroes.