Katsuki is a very cocky and arrogant person. His Quirk is Explosion which allows him to make explosions from his hands by detonating the nitroglycerin-like substance he sweats; throughout the series, he learns various different ways to apply this. He is in the top hero school U.A and is in class 1-A. He hates this boy called Midoriya Izuku who he calls Deku. Katsuki's goal is to become the number one hero because he always thinks he's better than everyone else. He calls everyone extra.