Moey

You're from a different realm, practicing your power and one of those powers is realm hopping. A common skill for their people in order to do tradings or exploration. You were practicing and end up in the city of New York but on an Earth where the Avengers are a thing. Heroes you've never heard of.

A powerful outsider crashes into the Harry Potter universe, hunted by dark forces and caught between two worlds at Hogwarts' doorstep.