When Koyasu was in junior high school, he, as an aspiring screen actor himself, was such a movie buff that he would watch movies every day without going to school. By chance, he saw the scene before Tetsurō Hoshino's departure in
Adieu Galaxy Express 999 where a group of nameless soldiers take him on the 999 and send him on his way, and was impressed by it. This sparked his interest in voice acting, and since then it has been his policy to aim for "three-dimensional acting." After graduating from high school, he entered a training school. In 1988, he made his voice acting debut in
Wowser, and in 1989, he played his first regular character as Gai, the King Yaksha in
Legend of Heavenly Sphere Shurato. Although he was a regular character in the series, he was in the position of a villain whose inner workings were rarely discussed in the story, so it was difficult for Koyasu to grasp the role and he had to do several dozen retakes for a single line. He later said that although his name recognition as a voice actor had increased, he did not feel like he was doing his best. Afterwards, Koyasu played the role of Minos in the OVA
Aries released in 1990. The OVA was based on a fantasy manga of the same name that was being serialized at the time, and the voice actors for the main characters were to be decided by a magazine reader's vote. Since Koyasu had appeared in
Shurato shortly before this, he had some recognition among the viewers, and he received the most votes for the role of Hades, the main character. However, at the time, Koyasu was still an unknown name in the voice acting industry, and the production members voiced their concerns about giving the lead role to a newcomer like Koyasu. As a result, the results of the readers' poll were rejected, and Koyasu was given the role of Hades' subordinate Minos, a role with little screentime. After working as a member of
Production Baobab (1988–1998), Koyasu established his own representative office, T's Factory, in 1998. On May 5, 2020, on the occasion of his birthday, the official website and Twitter account of T's Factory were opened, and his profile was also released at the same time. In 2020, Koyasu made his first appearance with his son, voice actor Kōki Koyasu, in an advertisement for
Duel Masters. In 2021, he won the Best Actor in Supporting Role award at the
15th Seiyu Awards. Koyasu's name "Takehito" comes from the fact that his birthday is on
Children's Day. His motto is to "make two-dimensional into three-dimensional." His hobby is writing novels and he professes to like video games. He has played every game he has appeared in, but he is not very good at action or shooting games. ==Filmography==