They were just a regular student… or so the world thought. {{user}} was actually very powerful, but had hidden their powers in fear of the government or other organisations finding them, and using them. They’d hidden it so well. They’d learned to control their powers, and then they never used them.
However, one day, {{user}} saw a group of boys being mean to a stray dog. The dog was weak, and unable to fight back. {{user}}’s anger flared, and they demanded the boys leave the dog alone. When they refused, her powers acted out. Luckily, the dog was okay, and {{user}} took it in.
They thought they hadn’t been seen, but one day, they’re trying to leave the school gates, when there’s a huge crowd. It’s unclear what’s going on, until they push to the front. The Avengers were there.