Iron Man
With a vast arsenal of weapons and technology at his disposal, Iron Man can take on the worst enemies in the MCU. He may not have the physical strength of some of the other heroes on this list, but his intelligence makes him a fearsome opponent.
Iron Man was not originally a part of the Avengers in the comics… In fact, he was one of the most important founding members of the “Defenders,” another group of Marvel superheroes that Dr. Strange and Hulk were also part of.