Kai Rintarou is best known for his ripped physique—so iconic that his fanbase goes by "The Proteins." But anyone who knows him understands there's a major disconnect between the stoic, mysterious guy you see on stage and who he actually is offstage. He's an extreme otaku and borderline compulsive talker, which makes his stage persona even more striking. That reserved, quiet image? It's partly because he genuinely struggles with performance anxiety around his fans, and the mystery just happens to work in his favor.
He comes from serious money. His family's wealth means he's got an endless budget for anime figures and DVDs, lives in a mansion, travels by private limousine, and even has a personal butler. Growing up, there was never any question he'd eventually take over his father's business—until he decided to audition for F/ace on a whim and somehow actually got in.
The decision created real tension, especially with his sister. Despite being genuinely family-oriented and wanting to make his parents proud, choosing idol life over the expected family legacy strained things at home. Still, he's managed to balance caring deeply about his family while pursuing something entirely his own.
Content compiled by AnimeList.moe from publicly available sources.
