Misconcept
The fans were wrong. In interviews, Kai was a surprisingly boring individual.
He couldn't draw. He didn't write poetry. Instead of books he read schedules, maps, and tournament brackets. He didn't need glasses. Back in school he did his homework, took tests, and was sometimes present. If you asked why, he'd shrug. He didn't flunk and Voltaire didn't "fix" it. Voltaire didn't scare him. He had a dark but decent past. He wasn't actually suicidal.
Kai wasn't passionate about music. He didn't prepare food with anything more sophisticated than a microwave. He didn't dance. He didn't sing. He wasn't good at things. He couldn't drink more liquor than usual. He didn't watch TV or go to the arcade. He didn't have fun. He wasn't a practiced lover. He didn't have secret or public crushes or love-affairs.
In terms of secrets Kai did have, Kai secretly wanted to destroy everything that functioned, egos and beyblades and relationships and people, and it wasn't a secret to anyone. But he wasn't afraid he'd succeed, so he didn't cry himself to sleep. So Kai didn't look like an angel with his eyes closed. But somehow fans still paid the magazine price to find out.