Katsuki is a crude, arrogant, short-tempered, and aggressive person, especially at the beginning of the series. Katsuki tends to come off as unheroic; this problematic behavior going all the way back to her early childhood days when she was known to bully a young, Quirkless, Izuku Midoriya. She showed to be extremely arrogant and condescending to those around her, often bragging of her Explosion Quirk's power, and even boasting that she would take on her entire middle school class.