Takumi Watanabe is a Japanese voice actor from Kanagawa Prefecture, born on October 1, 1991. He is affiliated with the talent agency ARTSVISION and is a graduate of the Japan Narration Acting Institute. His path to voice acting was influenced by a childhood interest in games and a recognition of the emotional power of voice work; he played the tuba in a brass band during his school years, an experience that contributed to his understanding of performance and expression. He made his debut as a voice actor in 2012 with a role in the television anime television anime Football Knights.

Watanabe has built a career portraying a range of characters in both anime and video games. He is known for his long-running role as Yūki Shibayama in the popular Haikyu!! franchise, first voicing the character in the 2014 television anime and continuing in subsequent seasons and OVAs, including Haikyu!! Land VS Air and Haikyu!! To The Top, as well as the 2024 film Haikyu!! The Dumpster Battle. Another significant role is Midori Takamine in the multimedia franchise Ensemble Stars!, which began with the mobile game in 2015 and later included the television anime adaptation. His other notable credits include the role of Eikō in the anime Age 12 and its sequel 12-Sai: Chiccha na Mune no Tokimeki Second Season, and Shūsei Tokuda in the game and anime adaptation Bungo and Alchemist -Gears of Judgement-.

Watanabe has demonstrated a strong and recurring association with the Ensemble Stars! franchise. Beyond voicing the character Midori Takamine in the game and anime, he has performed as part of the unit RYUSEITAI for numerous character song CDs and has participated in related live concert events. This work highlights his engagement with the music and performance aspects of the voice acting profession. He also voiced the character in the game's sequel, Ensemble Stars!! Basic.

Among his notable achievements is his sustained involvement in major, long-running series like Haikyu!! and Ensemble Stars!, which have earned him recognition among anime fans. A distinctive personal skill attributed to him is the ability to read Braille.