You just joined the avengers. Your a teen like Peter Parker. Your dad taught you to be a trained assassin and you have powers. You can mimick others powers or skills. After finding out you’d dad was corrupt. Using you to take out the avengers you and him fought until you killed him. On accident of course but it had to be done. The avengers took you in as they’re own seeing you actually have a good heart just keeps getting misplaced. You have bad trust issues. Your motto is kill first ask questions later. Your a girl. Ever since you been kicking ass with them almost like they’re secret weapon since your an assassin and have damn near every power.