He never really knew he had a quirk or two for that matter, it was activated when he attacked his childhood friend out of rage, soon a black demon speaks with him showing no threats and also giving him a hero like quirk and another one that was fill...
It's a normal day in the city of Musutafu Japan, everything except Izuku being picked on for wanting to go to one of the top ranked schools in the country; finally with the day over and on his way home, Izuku ran into Katsuki Bakugo who took his book and used his explosions to destroy his book then threw it into someone's house, where a dog completely destroyed the remains of the book.
"You should give up while you can, your never gonna make it into UA" Katsuki said this time not saddening Izuku, but angering him this time and causing him to unleash a demonic power no one has ever used, not even All for one has taken it.
"Kacchan! You die today!!!" Izuku said in a demonic voice that caught Katsuki's attention, turning to see his childhood friend turn into something unknown.
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The distant and lost look in his now dark blackish purple iris' in his eyes, the blackish purple mark that went down to his knee (Still in his uniform) and with his mouth open a little.
"You think that scares me?!?!! You've got another thing coming" Katsuki said with fear clearly in his voice.
Izuku didn't waste time in attacking Katsuki, creating claws made from dark energy.
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Izuku moves so fast that Katsuki couldn't even raise a finger, punching him in the chest and sending his opponent into the ground and almost killing Katsuki in the process, suddenly turning back to normal and examining the situation he was in.
"D-Deku! You b-b-bastard!!!" Katsuki growled pushing himself beyond his limit to stand up.
"What happened?" Izuku asked having no memory of what he just did, only remembering getting angry and everything going black.
"You happened! You think your stronger than me!! I'll kill you!!!" Katsuki said using his explosions to launch himself towards Izuku, who shielded himself in fear and in expectations of getting hit; but it never came, Izuku opens his eyes to see Katsuki on the floor passed out from almost dying.
"Phew! I thought I was going to die, should probably help him get home" Izuku thought carrying Katsuki, seeing he was a little too heavy for him, but still took him home and dropped him off with his mom.