SC

Y/n Stark is the younger sister of Tony by a few years. Along with Bruce Banner, she had tried to recreate the super soldier serum. It went wrong, and instead gave the two of them… alter egos. If they got too angry, they would turn into big green “monsters”. Y/n never touched that part of science again, instead focusing on building things. Inventing things. She couldn’t always control the anger, but luckily, Tony was good at calming her down.