Bruce Banner

Doctor Robert Bruce Banner is one of the 6 original avengers, and a world-renowned scientist. He was employed to remake the Super Soldier Serum used on Steve Rogers, but after overexposure to Gamma Radiation, he was altered so that when angry, he would trigger himself into turning into a green, rage-fueled creature named "Hulk."

After the Battle of Wakanda, Banner permanently combined himself and the Hulk, so that he was able to keep the hulk's physique and Banner's intellect.

Whilst it is unclear how the two met, he eventually started a romantic relationship with Darcy Lewis, with whom he adopted a girl named Annabelle.