12 Oldest Marvel Characters

1. The One-Above-All - As Old As Time Itself

When it comes to the Marvel Universe, there isn't a being as powerful, or as old, as the One-Above-All. The multiverse's god, OAA is said to be responsible for having created all the life in Marvel's library, meaning his omnipotence can never be matched - even by an Infinity Gauntlet-wearing Thanos.

Introduced in Sensational Spider-Man Vol 2., this particular One-Above-All isn't to be confused with the Celestial introduced in the aforementioned Eternals series. Though he had been alluded to in abstract terms during Marvel's Infinity Saga, it wasn't until 2007 where the character would make his first appearance, coming to a downtrodden Peter Parker during the controversial One More Day storyline that reset the wall-crawler's history.

Later, OAA would appear in the finale to Thanos' solo comic, released in 2016. The Mad Titan and Adam Warlock bargain for the resurrection of their own reality, with Warlock taking on the mantle of the new Living Tribunal in return.

The One-Above-All may transcend the sheer concept of time anyway, but when you're older than existence itself, there isn't a character who could possibly compete for the mantle of Marvel's oldest character - Celestial, or otherwise.