Brook

Masachika Kouda

幸田柾近
Rei's shougi teacher. He was both Rei's father's friend and rival in shougi. He cared for Rei like he did for his children and taught him shougi. (Source: Wikipedia, edited)
Sinclair, Ian

Ookawa, Tooru

Japanese
Sinclair, Ian

Clarke, Cam

English
Sinclair, Ian

Yamanoi, Jin

Japanese