Ken Kitazawa

This brilliant young boy, the son of Professor Utonium, possesses a unique and powerful connection to the Powerpuff Girls Z and other characters, wielding Chemical Z to transform others into villains. Despite his young age, he displays a remarkable maturity and advanced knowledge, having earned a PhD early on. He navigated his childhood by seeking social interaction and befriending others, including Jou and Kuriko, whom he views as older sisters. While he maintains a close bond with the girls, he balances this with a more formal respect for his father, shifting between calling him "Papa" and "Professor" depending on the situation.