—Rui Kamishiro

Wonderland X Showtime is a musical troupe consisting of four part-time actors performing on the Wonder Stage at Phoenix Wonderland. At one point, Tenma Tsukasa was hired part-time at the theme park, but his assigned stage at Phoenix Wonderland wasn't attracting any visitors. Then he met Otori Ema, who wants to restore the stage to its former glory. They team up with director and roboticist Kamishiro Rui and the shy singer Kusanagi Nene, who has a robot version of herself, Robo-Nene.

A fellow troupe member and friend. After their first performance, which was a disaster due to an oversight, Rui harshly criticized Tsukasa for blaming Nene, concluding that he was a superficial narcissist who viewed performances as a means to attract audience attention. However, Tsukasa apologized and, during the performance, expressed his true feelings to Rui, and they reunited. Rui now views him as an actor worthy of the stage and is confident that he can give him very complex (and sometimes dangerous) stage directions, knowing he will embrace the role with pride. At school, the two of them are known as "The Strange Combination," causing mayhem and trouble on campus on a daily basis. However, it is mainly Rui who causes the problems and drags Tsukasa into them. Tsukasa is a person to whom Rui is immensely grateful, as he was one of the first to completely trust Rui's direction, for which Rui expresses gratitude. Rui thanks Tsukasa for giving him a chance to change. He once thought he'd never be able to properly communicate or understand others without performing, but when he started performing with Tsukasa and everyone else on Wonder Stage, his feelings gradually began to change. He also says to himself that Tsukasa has the ability to make him smile endlessly.

Rui Kamishiro is the director and producer of the WonderlandXshowtime troupe. He has purple hair with two blue streaks, small blue earrings, and yellow eyes. He most often wears a large light-colored sweater with blue, light yellow, and brown accents, along with gray pants. He's a mischievous and teasing young man, but when the situation calls for it, he instantly becomes serious and collected, his feline nature fading into the background. His signature smile is called "cat-like." He dreamed of becoming a director since childhood, and from an early age he wrote literally crazy plots, putting his young actors in danger. As he grew older, people began calling him a weirdo, a freak, and an outcast because he was so passionate about robotics, engineering, and mechanics, but he also unintentionally endangered the lives of people who acted according to his scripts. He was a withdrawn teenager and trusted few people, only a few (like Nene, who were neighbors), but after he transferred to the same school where Tsukasa was, he immediately blossomed and became the well-known Kamishiro. He loves building robots and creating new scenarios. He flatly refuses vegetables on his plate.