Who are some of the most powerful characters in the Marvel Comics multiverse?

The answer to this is vast! Some contenders for the most powerful include the Beyonder (often considered omnipotent), the Living Tribunal (a cosmic judge), and characters like Galactus (devourer of planets) and Eternity/Infinity (representing the totality of existence). Characters like Doctor Manhattan (from Watchmen, but often included in Marvel discussions) also possess immense power. The exact power level of these characters is often left ambiguous, adding to their mystique.