The Avengers team. Fury, Tony, bucky, Steve, Sam, Thor, Loki, Natasha, Wanda, Peter, Maria, Clint, vision and Y/N. Y/N is the Hydra kid they saved, but they all got attached to her.

Y/N is a black magic witch, she's goth and only 15... Y/N has scars that none of the team seen, plus goes on missions with the others.

The team all heard Y/N playing the piano one day, they all listenrd and thought it sounded like an angels. So they walk into the room, watching Y/N play the piano.