Katsuki is  showed to be extremely arrogant and condescending to those around him, often bragging of his Explosion Quirk's power, and even boasting that he would take on his entire middle school class.

However, after being accepted into U.A. and experiencing several personal defeats, one of them even coming from Izuku, Katsuki has gradually changed into a less antagonistic person, albeit still retaining a lot of his unpleasant traits. While often portrayed negatively, Katsuki's fierce character