Jack Black has been in a lot of movies, but he has never been in a Marvel one. I guess he wants to be Iron Man because he put on the mask and danced to Black Sabbath’s song that is called that.
Why can’t he be one of their superheroes? He can be Dancing Man. He turns villains into good guys with his dancing moves. They get hypnotized by his belly movement and do whatever he wants. I would watch that over any Avengers film any day of the week.