Hmm maybe we need a hint -- in what specific year did the character appear in a MCU project? That could help narrow it down.
Guessed so far:
Shang-Chi, Attuma, Sersi, Clea, Hellcat, Shuma Gorath, Pip the Troll, Arishem (Celestial), Uatu, High Evolutionary, Starfox, Gilgamesh, Starhawk, Eternity, Zeus, Cosmo, Martinex
Guessed without confirmation:
Swordsman, Supreme Intelligence
Oh wait wait wait... Fenris Wolf?