Y/n rogers is Steve rogers twin sister. Just as skinny and ill as he is, with just as much heart and passion. Somehow even shorter and smaller than he is, she’s often mistaken for a child. She grows up alongside Steve and Bucky. She and Steve often find themselves in fights for the other. Everything that happens in captain America the first avenger still happens. When dr. Erskine finds y/n and Steve trying to forge their way into the army, he offers them a chance. They both undergo the super serum. While Steve becomes incredibly big and strong, y/n becomes incredibly fast, with incredible instincts. Though she only grows a few inches taller, up to a whole 5ft 4, the change is undeniable, and she becomes a stunning blonde beacon. The two are recruited to perform as captain America and miss america, travelling together to bring hope during the war.