The Keyblade Duo

Izuku Yagi was abused and neglected by his parents and bullied by his sister and friends every day until one day, they went too far. They try to apologize to him, but Izuku snapped and became a vessel for All For One because 1. he was pulling the strings of things and 2. he was the heartless king. It wasn't until his real friend, Ochako Uraraka, saved and freed him from All For One's grasp.

From there, Izuku was waiting for his punishment for almost killing innocence, but wasn't because Uraraka told Nezu everything that happened and he was being controlled by All For One. From then, both of them were trained by Yen Sid and the other Keyblade wielders in order to defeat All For One.

After the training, they returned back to their world, they enrolled in U.A university but saw Izuku's old life here as well.

Will he forgive them or leave them in the dust?

This is inspired by @Tojamaru's Kingdom Hearts story, @LRGriffin's IzuOcha's books, and Sora in Smash.