Rui lives by his own set of rules, which causes people to consider him a weirdo. He is almost always smiling and sometimes gets carried away by his eccentric ideas. This includes using people as test dummies for his ideas and waterboarding them in swimming pools, as stated by Nene. Despite the apparent riskiness of his ideas, Rui does his best to take safety into consideration. In the event It's On! Wonder Halloween!, Rui becomes deeply concerned about Tsukasa's safety, and subconsciously holds himself back as a result.

Rui also has levels of curiosity that borderline on obsession, as he loves to take toys and home appliances apart to see how they work. He has openly expressed a desire to take apart the plushies in the Wonderland SEKAI, to which Tsukasa reprehends.

He cares deeply for his friends, as shown when he defended Emu and her dreams from her brothers, as well as building NeneRobo to help Nene with her fear of talking to others. He is also a teasing and playful person, with an example being his constant ideas for performances that often involve putting Tsukasa's life in danger.

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Kamishiro Rui

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