Lady Chaos is an alter-ego of Marvel comic's Death, seen only in the Silver Surfer cartoon series she is redesigned to keep the show more "family-friendly" but in-universe can be explained as being another aspect of Death (much like Oblivion).
Just as mainstream Thanos is madly in love with Death so the version of Thanos found in this cartoon is a devoted servant to Lady Chaos.
Powers / Abilities
- Her name could be a mix of her feminine traits in the comics ("Lady Death" or "Mistress Death") as well as the destructive qualities of Oblivion : it is also (out of universe) used to avoid the term "Death" in what was considered a "kid's show" at the time.
- Her fiery visage is quite similar to Dormammu but has a more spectral feel, fitting as an alter-ego of Death itself.