Shinichi Kudo

Shinichi Kudo is high-school student who loves helping the police by solving crimes. But when he is poisoned in the first episode and his body shrinks, he plays dead and creates a new name for himself, Edogawa Conan. His voice is often heard when Conan is thinking since that is how he really sounds. And in some later episodes he does find a way to revert to his old body, even if only temporarily.