Takehito Koyasu
In the "Tokyo Babylon" original video animation, Seishiro was first voiced by Takehito Koyasu, who was replaced by Tōru Furusawa for the 1996 film "X". Otoya Kawano took the role in the television adaptation. Hiroki Tōchi played Seishiro in "Tsubasa: Reservoir Chronicle", and the character will be voiced by Yūichirō Umehara in the television series "Tokyo Babylon 2021".