both hero and villain deku.

I have been creating this story in my mind for a very, very long time. it was when Izuku was little his dad gave him a shot and made him see another version of himself, a villain version of himself. he used to be close with him when he was little, but when he did took over his body, he made him vanish. a few years later..
he returned.. but differently then expected..
what will everyone do?
whats different about this villain version of izuku?
what will happen?