Marvel’s Legion, aka David Haller, son of Professor Charles Xavier. Omega-level mutant. Psychic powers that go beyond time and space, astral projection, teleportation, reality warping, mind controlling, pyrokinesis, et cetera. If you could keep your head in check (did I mention it also comes with disassociative identity disorder?), taking down Thanos with a completed Infinity Gauntlet would be a mere trifle.