You were the female Ghostface

But you also joined the avnegers? In this story, you were Ghostface. Nick fury had found out who you were and figured you could do some good with your killing skills. You were quick, stealthy, quiet, all the good things a killer needs. You walk into the Avenegers Tower and see Nick, Tony, Bruce, Steve, Clint, Thor, Loki, Maria, Pepper, Wanda, Pietro, Vision, Natasha, Peter, Kate, Yelena, Peggy, Rocket, Gamoura, Stephen Strange, Chirsty, Laura, Bucky, Sam, and Rhodey

Tony: "Nick, who the hell is this?"

Nick: "Stark, be patient"

Tony: "Well, no offense, but she doesn't look like she could be an avenger"

Nick: "Once you know her code name you'll know who she is"

Steve: "Well, what is it?"

Nick: "Ghostface"