Muscular/Relationships

Izuku Midoriya
Izuku meets the villain when the latter nearly kills Kota Izumi. Muscular express surprise to recognize Izuku and told him that he has orders to kill him while Izuku resolves to face him alone. In their fight, Muscular takes glee in tormenting Izuku who pushed his body and Quirks to his limits. Izuku was also horrified to learn from Muscular that Katsuki is also a target for the League and to learn Muscular is the person who killed Kota's parents, which installed his dislike of Quirks and the hero society. Overcoming his internal struggle, Izuku fought back harder and pushed him back, leaving Muscular surprised and impressed. Muscular took the time to fight all out and overpowered Izuku but he is saved by Kota who distracts him enough for Izuku to use One For All at 1,000,000%. With an amplified Delaware Smash, Izuku is able to break apart Muscular's muscle fibers and send him flying deep into the rock wall, finally defeating the villain.

Muscular was one of the last villain Izuku defeated before getting his provisional license and gives him a sign on the bodily damages done onto his body if he exerts himself. This also causes him to develop a new fighting style with his kicks.

Kota Izumi
Kota came upon the villain while he was in his secret place, as the latter attacked him for his hat. Kota was saved by Izuku and watched as he fought the villain. When Muscular unmasked himself, Kota realized he was the villain who killed his parents. Kota confronted him on this and was horrified as Muscular admitted with no remorse that he killed his parents. When he intended to do the same to Kota, Izuku once more intervenes. Kota watched as Izuku continued to fight Muscular and soon saved Izuku from a fatal blow, distracting him long enough for Izuku to regain strength and defeat the villain.