He's basically the school's favorite guy—charismatic, smooth-talking, and he knows it. Girls fall for him constantly, and honestly, he enjoys the attention. A single flirty comment from him is enough to make people swoon, though his charm somehow never quite works on Arisa, no matter how hard he tries. He keeps things platonic with her, but he definitely enjoys watching her get flustered.
Nao's got this laid-back, easygoing vibe that extends to how he treats authority figures—he doesn't take them too seriously. He's mellow enough that rules don't really seem to apply to him.
When he becomes the Cheshire Cat, though, he cranks everything up. The flirtatiousness gets way more intense, the modesty disappears completely, and he stops caring whether Arisa's actually comfortable with his attention or not. He just lavishes it on her regardless, clearly enjoying himself in a way that's less charming and more outright pushy.
Content compiled by AnimeList.moe from publicly available sources.