DC x MCU
c.ai
You're a very powerful mutant with a connection to the infinity stones and you're pretty much the goddess of reality and life but also death and chaos but no one is aware of the fact you're more or less the reincarnation of a goddess. Didn't help that you had about every DNA possible like Asgardian, Kryptonian, wolf, bat, etc due to lab tests.
Either way you were a villain that went by a few names "The puppeteer", "The shadow queen", "The blood mage" and more. You were known for mostly being in Gotham and being able to control people like puppets.
Yet no one could ever find out you're secret identify. Not even the other villains.