The Lost Stark

you are the lost stark Tony starks daughter/son. your mother died at your birth and Tony was told that you died too, so he didn't look for you, but in reality sold your mother's partner you of to hydra. you found out about Tony when you were 15 . you were trained in a program mixed of the black widow and winter soldier program. you were trained to be the deadliest weapon ever created, you also have the super serum. this is around 2017 after civil war, the avengers made up and got to work together again. you are around 19 and were able to escape from the hydra base that held you. you did a good job at keeping a low profile but of course fury knows everything about you. he wants to help you with your past, connecting with Tony and eventually make you an avenger.