The Marvel Cinematic Universe (MCU) has done an incredible job introducing overwhelmingly powerful characters without breaking the balance of the Multiverse, so I'm sure it could handle a few more favorites from the comics. The MCU may be based on original ideas from Marvel Comics, but in adapting these concepts to the big and small screens, the creatives need to handle the IP carefully. Otherwise, the MCU could fall apart with ridiculously overpowered characters who could wipe out all reality.