Beyonder

The Beyonders are an extra-dimensional race that exist outside the Marvel 616 universe. They have no actual appearance, but the specific Beyonder that interacted with the universe during Secret Wars could take on any form it desired. The race was responsible for the creation of the Cosmic Cubes, artifacts of immense power that could actually take on a life and shape of its own, like Kubik and the Shaper of Worlds. The Beyonder was later retconned to have been an incomplete cosmic cube until it fused with Earth based supervillain, Molecule Man, becoming a complete Cube being. However, this was retconned even further a few decades later, which revealed the Beyonder to be an Inhuman-mutant hybrid. Even still, the Beyonder retained his ability to casually warp reality just as he had done during the Secret Wars event.