this is tough but primarily the MCU? onces that come to mind immediately are Green Goblin, Sinister Six, Thanos, Kang The Conqeuror, High Evolutionary, Hela, Wanda The Scarlet Witch, Loki, Mysterio, Sylvie, Dormammu, Strange Supreme, Infinity Ultron, Abomination, Ego, Namor, He Who Remains and soon to be Doctor Doom and The Beyonder!
I'm so hopeful that you will someday be hired by Marvel Studios to be the writer and composer for the soundtrack to Avengers: The Kang Dynasty, your compositions would fit perfectly with the darker tone and theme as well as be able to make the Avengers theme flow so seamlessly into the Kang theme