7. Bruce Banner (Hulk)

"We have a Hulk."

Those words may have caused Loki to scoff at the time, but the God of Mischief wasn't smirking a few minutes later when he found his body thrashed to a pulp by scientist Bruce Banner's "always angry" alter-ego, the Hulk. Sure, Banner's unhinged green goliath, the result of a gamma radiation overload, may sometimes work against the Avengers, as there's rarely a reliable method on hand to stop the Hulk once he ramps up into rampage mode (unless you're Black Widow). But there's no arguing that Banner, as both genius and brute, is a bonafide double-threat. And now that he's fully merged the warring sides of himself into one form, he's near-unstoppable. (Though it remains to be seen what's up with him being back in human form in Shang-Chi and the Legend of the Ten Rings.)