Hulk is the green-skinned, muscle-bound, enraged alter ego of mild-mannered Bruce Banner. Thanks to the recent slew of Avengers movies, almost everyone knows about him and how, while conducted experiments with gamma radiation, Bruce was inundated with the particles. The result is the Hulk, a presence within him that is triggered in high-stress situations.
The Hulk is normally a hero, and there have been many varieties of the Hulk, including the Grey Hulk and a Hulk that was the successful merger of the Hulk's body but Banner's mind.
Below are the characters found available on the site that cosplayers have depicted.