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Plot: Izuku gets One For All and things go pretty normal, aside from a growing love for carrots and greens. His energy is up and he gets called Usagi by his classmates because he is always bouncing in place, he doesn’t mind the name and even lets the girls in class give him space buns to look like a popular pre-quirk manga character. (Sailor Moon)
The class goes to USJ where the villains attack, Izuku defends Asui "Tsu" from Shigaraki but ends up getting grabbed around the neck by him, Shigaraki’s quirk activates and Izuku goes down. Tsu is still in danger, Aizawa is looking on in horror, and Shigaraki is laughing at what he had done to spite All Might for not being there.
An explosion of black and green energy comes from Izuku’s body that knocks Shigaraki away from Tsu. The energy condenses back around Izuku in the shape of a large bipedal rabbit, it is staticky like Dark Shadow with glowing green eyes. Izuku doesn’t react to talking and only attacks Shigaraki and then the Nomu he sends at Isuku, he fights like a feral animal against the Nomu as Tsu goes to Aizawa to check on him.
Izuku has damaged the Nomu enough it’s regeneration has slowed down a lot, so by the time All Might arrives the fight ends quickly. Izuku doesn’t attack All Might, he isn’t a threat, and goes to the hurt Aizawa instead, lightly nudging him with clawed paws until he makes a sound to show he is alive. Once the other teachers arrive and the students are found safe, Izuku passes out as the energy goes back inside, danger is gone and he can get healed. (His neck is still very damaged but he isn’t dying so yay!)