Spiderman. He's an Avenger, has to deal with all of Ironman's enemies, and defeated Thanos. Not to mention that Peter Parker has survived the Infinity Snap. AND no matter what, Spiderman always comes back, despite however many times he dies. And at the times(so far only once) when he DOES stay dead, there is always someone who is willing to take his place.
Oh, he's also killed Mysterio, the craziest villain that the mcu has ever seen(not counting Thanos).
