So, what would happen if MJ was in the MCU? Well, he'd die because he has no powers. So, let's think of possible powers. He would most likely have Vibe's (DC) powers (if you don't know Vibe when he dances, it creates shockwaves) and Black Bolt's powers (ultrasonic vibrations when he uses his voice.) We can suit that to when MJ sings or dances. Would he be powerful? Well, considering he both sings and dances, we can assume he uses both at once. So, yes, he'd be very powerful. He would still lose to Darkseid, so... What about his name? A good fit I think would be "Moonwalker." So there you have it!