Tatsuyuki Jinnai was a Japanese actor and voice actor, also known by his birth name, Kōichi Hōtatsu. He was born on February 21, 1933, in Hokkaido, Japan, and graduated from Nihon University. Jinnai passed away on April 12, 2000.

His career in the entertainment industry spanned from the late 1950s until the year 2000, during which he was active both as a live-action actor and a prolific voice actor in anime and dubbing. Throughout his career, he was affiliated with several talent management firms, including Tokyo Actor's Consumer's Cooperative Society, Tokyo Geijutsu-za, Production THC, and Ezaki Productions, before finally being represented by Theatre Echo.

Jinnai built a substantial body of work in anime, particularly active from the 1970s through the 1990s. He is well-known for several key roles that the user mentioned. He provided the voice for Helmuth J. Lecoque in the 1981 mecha anime series Fang of the Sun Dougram (Taiyou no Kiba Dougram), a role he also reprised in the 1983 short film Choro Q Dougram. He voiced Sima Yi in the 1986 historical anime film Sangokushi II: Amakakeru Otokotachi. He played the role of Shōzō Kai in the 1988 original video animation (OVA) Mahjong Hishō-den - Naki no Ryū. He also voiced Colonel Karl Roland in the 1990 OVA Sin Karate Jigokuhen: Chi no Mokushiroku.

Beyond these specific titles, Jinnai's other prominent anime roles include the Narration and Demon Admiral Darutan in Brave Raideen (1975), Amandara Kamandara in the Heavy Metal L-Gaim OVAs (1986-1987), Nicolas Boltec in the Legend of the Galactic Heroes OVA series (1988-1993), and Principal Kunou in the popular series Ranma ½ (1989-1992). His later anime work included roles such as Dr. Hans in Rurouni Kenshin (1996) and Anthony Gauss in The Big O (1999). He also appeared in numerous other series, including Science Ninja Team Gatchaman, Invincible Super Man Zambot 3, and Future Police Urashiman, and had a role in the Studio Ghibli film Porco Rosso (1992) as the Mamma Aiuto Gang boss.

In addition to anime, Jinnai was an active actor in live-action television dramas, appearing in series such as the long-running jidaigeki Onihei Hankachō, in which he also served as the fourth narrator for the version starring Kichiemon Nakamura in the late 1990s. He was also heavily involved in voice dubbing for foreign films and television series; one of his noted roles in this field was providing the Japanese voice for Warden Norton in The Shawshank Redemption. Furthermore, he was a regular voice contributor to the Kamen Rider franchise, providing voices for numerous monster characters.

Due to his passing, several of his roles were taken over by other voice actors in subsequent projects. For example, Kappei Yamaguchi took over as Narrator for Brave Raideen, Kōsuke Meguro succeeded him as the narrator for Onihei Hankachō, and Kōichi Yamadera voiced Principal Kunou in later Ranma ½ projects.