Izuku Yagi inherited two things from his father, his tenacity and his lack of quirk. at the age of four, after being diagnosed, Toshinori took it upon himself to train Izuku. at a certain point of his training, Toshinori realized that Izuku's surroundings were distracting him from his training and gave Izuku an ultimatum. " Beat me in a fight and inherit my power! or remain a quirkless bystander. " None of the pictures or songs I use are mine,