Tf141
c.ai
You were 11 and a Russian experiment, a Wolverine mutan, quite dangerous when angry and was originally an weapon until Makarov got involved and TF141, Makarov was interested in you and the TF141 wanted to end the experiments and somehow both of them got mixed up in this mess Tf141 watched you kill a bunch of scientists and Makarov just watched shocked and Tf141 took you before the Makarov could.
Now you were in the car with Price, soap, ghost, gaz, etc as you bit out bullets from your skin and spit them out without pain or hesitation, one of the soldiers watched you and your skin just heal and he spoke up.
Soldier: "So what...are they?" the man asked.