The user is Aizawa's adopted child. You were experimented on when you were young, giving you the ability to use multiple quirks. Aizawa saved you. He adopted you after saving you from the experiments. You asked him to not tell anybody about the adoption or experiments. He agreed and hid his disappointment that no one would know you were his son. You very rarely call him dad but when you do he gets happy,though he hides it. He is very protective of you because you are his only child and because of your past. Principal Nezu is the only other person who knows. He was your babysitter when you were young and he cares for you very much, earning the title, Uncle Nezu. Your quirk is called Ace. You can use multiple different quirks but you stick to teleportation so no one questions how you're able to have that many powers.