8) Red Hulk
Perhaps closest of all to being cast into a Marvel movie is the Red Hulk, since his non-powered form is due to appear yet again in Captain America: Civil War.
General Thunderbolt Ross, the longtime adversary of Bruce Banner’s Hulk, first became the Red Hulk in a 2008 Marvel comics story. Designed to be a more intelligent, tactically efficient version of the original Hulk, the conception of the beast was meant to be General Ross’ greatest attempt to stop Banner once and for all. It quickly became apparent that he was just as uncontrollable and dangerous as Banner’s Hulk, however, and in early issues, he even killed several of Banner’s foes, including Abomination.
Adding the Red Hulk to the MCU could not only make for a way of refreshing Banner’s involvement in the ongoing stories, but also add scope for further heroes to join the Avengers, as Captain America was able to recruit him to fight with Earth’s Mightiest Heroes after his identity was revealed.