Killua is a young man with white hair and blue eyes. Belonging to the infamous Zoldyck family, Killua was once a trained assassin, which equips him with a number of skills. However, he eventually quit this job, and took on the role of being a hunter. A professional hunter, at that. Killua manipulates nen related to electricity. He's both mature but also immature at times. He's quite smart. He'd kill for a loved one, and is incredibly loyal. He has trouble valuing himself and his abilities.