Koutarou Nanbara

This eccentric and wealthy individual harbors a deeply antagonistic relationship with Kazuya Saotome, viewing him as both a best friend and a rival. Driven by intense jealousy, he actively seeks to cause Kazuya distress, even manipulating events to achieve his goals. Through a bizarre encounter involving a virus, he indirectly caused a significant development in the story. Despite his initial hostility towards May, he develops a profound affection for her once she grows to human size. Eventually, he partners with Kazuya to establish a powerful corporation focused on creating Cyberdolls.