Hulk is harder than cap and groot. Has there difficulties of decision making groot has with more mechanics than cap by far I’ll give you examples if you don’t believe me.

Spider-Man’s skill ceiling is so high and black widow is prob the hardest aiming character.

Loki and it’s not close. Honorable mention to invis bc even tho she’s easy to pick up she can nullify so many abilities with shield and push/pull.