The Living Tribunal is a vastly powerful humanoid cosmic entity who has existed as long as the universe itself. Its function is to safeguard the Multiverse (the total sum of all universes) from an imbalance of mystical forces. It may act to prevent one universe from amassing more power than any of the others, or from upsetting the cosmic balance in some way. The Tribunal may also act to prevent an overwhelming imbalance of good or evil within a universe. When a matter involves only one universe, the Tribunal may leave the final judgment to the "abstract" entities there (in Earth-616's universe, Lord Chaos and Master Order). The Living Tribunal doesn't possess alternate counterparts, as there is only one Living Tribunal in the Multiverse. However, he does or can exist simultaneously in multiple planes of reality, giving the appearance of multiple variations to the human perception.
The Living Tribunal is found in the Marvel Universe.