Izuku has been experimented on for 11 years the reason he looks 6 years old because, one of the experiments made him look 6 so they could easily drag him around. (And who wouldn't want a baby Izuku). Izuku has what looks like metal plates that have mangled red fur on them, their all in different places. He has two metal fox ears that are broken, and same with a fox tail that is broken. This is a Five nights at Freddy's crossover their is a soul stuck in side of his 'mindscape' and I'll explain more as we get into the story. Also the soul can take half or whole control over Izuku's body. When it's half one of his eyes turn a dark yellow with a slit in the middle. And when it's whole control he turns into Nightmare Foxy.
(If you don't like this then your free to leave this story I'm just doing this for fun. And I hope this makes sense to you)