Harry Potter and the Phoenix

On the day Voldemort attacked the Potter family, Harry unlocked the power the Dark Lord knows not. Lily's sacrifice of her own life grabbed the attention of a powerful being, which took interest in the Boy-Who-Lived.

This is a HP/Marvel FF. Will focus on the HP side in the beginning before moving on to the Marvel side. Since this is a FF, the years would slightly different. Example, here Harry was born in 1999. Yes, he is a zoomer.