Kobayashi Hikaru

Hikaru is an average Japanese boy. He experiences bullying at school, which his friend Koichi tries to protect him from.
He has a weaker personality than Koichi and often needs someone to stand up for him. Koichi says that he "laughs like a frog".

Spoiler

As a ghost, Hikaru is concerned with helping Koichi, and feels apologetic for making him feel guilty. On one occasion, he appears as a frightening mangled spirit, angrily declaring he won't let anyone bully Koichi.