Sersi

First Appearance: Eternals v1 #1 (July 1976).
Appearances: Many others.
Years Active: 1,000,000 B.C.E. to the present.

Sersi is an Eternal. She is a light-hearted partier, but has been active on the side of the good guys in a number of different and varied circumstances, helping expose the false "Merlin" in King Arthur's court and being active in ancient Rome.