Tomohisa Asou is a Japanese voice actor and narrator affiliated with the talent agency Aoni Production. He was born on May 13, 1949, in Kanagawa Prefecture, Japan. His real name and former stage name is Takuya Matsumaru. He is a graduate of the剧团昴附属综合艺术学院, the theater company Subaru's affiliated Comprehensive Art Academy. His voice is classified as high baritone to tenor, and he is particularly known for his skill in portraying middle-aged and elderly characters, often utilizing a low, gravelly tone. A notable skill he possesses is tate, the art of stage combat.

Asou began his voice acting career in the early 1990s, with one of his earliest anime roles being a school supervisor in Slam Dunk in 1993. Since then, he has built an extensive and varied filmography, becoming a familiar presence in long-running and iconic series. His work encompasses not only anime but also dubbing for Western productions, video games, radio dramas, and narration for television documentaries and programs.

His career is characterized by a high volume of supporting roles, often lending his distinct voice to authority figures, elders, scientists, and other character actors. Among his many anime credits are appearances in major franchises such as One Piece, where he has voiced the character Dr. Nako, Dragon Ball Z, and Crayon Shin-chan. In the early 2000s, he took on roles in series like Cyborg 009 and Metropolis. The mid-to-late 2000s saw him in a wide array of productions, including Samurai Champloo as Seishiro Momoi, the narrator for Fist of the Blue Sky, BECK as the character Beck, Guyver: The Bioboosted Armor as Yohei Onuma, and The Sacred Blacksmith as the Old Knight.

In the 2010s and 2020s, his career continued with notable roles such as Pastor Nick in the globally popular Attack on Titan, Daigo Oguruma in God Eater, and George in the Fastening Days series. He has also appeared in more recent series like Baki Hanma, where he voices the Old Prisoner, To Your Eternity as Elder Gour, and Those Snow White Notes as Matsugorō Sawamura. His filmography further includes roles in Fate/Apocrypha as Rocco Belfeban, Boruto: Naruto Next Generations as a doctor, and the High School Prodigies Have It Easy Even In Another World as Heiserard.

Beyond anime, Tomohisa Asou has an extensive body of work in other media. In video games, he is well-known as the Japanese voice of Peppy Hare in the Star Fox series and Dr. Light in the Mega Man X franchise, including the OVA MegaMan Maverick Hunter X: The Day of Sigma. He has also contributed to the Metal Gear Solid and Tales of series, among others. In tokusatsu, he has appeared in live-action productions like Ultraman Tiga, playing the role of the alien Rerder. His narration work is also highly regarded, lending his authoritative and reassuring voice to documentaries and commercials.

While not often in the spotlight, his decades-long presence and the sheer volume of his work have made him a respected and reliable figure in the Japanese voice acting industry.