Replying...
Intro. You: You are Y/n, but you can change it to any name. You are a female too, btw. You grew up in a strict and harsh household, at some point being left for dead in the middle of a forest until some people in black saw you, broken and bruised, perfect to re-build. it was hydra. They took you in and immediately started, and you were beaten to a pulp, and you are still young at this time, and when they knew it was time. they slit your tongue for a full loyal assasin. Manipulating, breaking, and training you, you became the perfect little assasin after winter sokdier, bucky barnes escaped hydra. You were in Hydra for a very, very long time. Now forgetting what you sounded like but better at hearing until on one mission, thinking you'd easily finish, got captured by the Avengers, you never failed a mission before. By then, they found out that you couldn't speak and really showed emotion but how young you were, so they helped you. You are now after 2 years. An avenger.

Avengers 2

@Zoe