
Quick answer — Tetsuo Kanao voices Bui in Yu Yu Hakusho: Ghostfiles, Kokuyo in Dr. STONE, Gert Zweig in ASTRA LOST IN SPACE and 13 more characters.
Tetsuo Kanao voices Bui (Yu Yu Hakusho: Ghostfiles), Kokuyo (Dr. STONE), Gert Zweig (ASTRA LOST IN SPACE), Gen Kudou (Kono Oto Tomare!: Sounds of Life), Uesugi (Detective Conan: Magician of the Silver Sky), Vim Jeturk (Mobile Suit Gundam: The Witch from Mercury), Iwasaki (Oblivion Battery), Kouhei Araki (The Great Passage) and 8 more.
Bui is voiced in Japanese by Tetsuo Kanao.