The voices...

It was just a question of time right? I mean, it was obvious that this would happen...

Since Izuku's first time seeing the earlier users of OFA, he was able to form a spiritual bond with them. Being able to hear and see them at times he needs their advice or help. If it was Yoichi Shigaraki, Kudo , Bruce, Hikage Shinomori, Daigoro Banjo , En Tayutai or Nana Shimura, someone was always there, watching his every step, every word he said and every thought he was thinking, he was never. alone.

At first it seemed like a pretty good help for making the right decisions or winning arguments or something else... but it slowly turned from a gift into a curse. Ver fast it was clear that he was the chosen one to fight and kill AFO forever, no matter how gruesome killing was. No hero-code could change what must be done.

When the war was near, the voices of the users' ghosts were getting louder, more frequent and more assertive. No matter if it were just words they thought in rage in an argument Izuku had, or even actions that were really unlike him, the voices would eventually pursue him to do it their way.

Ultimately driving him into insanity

you were all together in the common room when Izuku's sanity dropped lower each second until he snapped, jumped up, paced arounf the room in a rush and yelled with his head in his hands.

Izuku: ''SHUT THE FUCK UPPP!!! YOU ARE ALL JUST USING ME!!!''

You guys knew about the voices and people he saw and heard, but right now you weren't sure who he was talking about. Was it the ghost's or was it the class that he thought he was being used by? He cowered in one of the corners of the room, shaking with his whole body and his eyes widened in horror, fear and pure insanity. This boy officialy went stone-cold crazy...