Takahiro Sumi is a Japanese voice actor from Gifu Prefecture affiliated with the talent agency Ken Production. He was born on February 15. Sumi graduated from the voice actor department of Amusement Media Academy in 2015 and is also a graduate of the 17th term of the voice actor training school School Duo.

His career, which began in the late 2010s, encompasses a wide range of roles in anime television series, animated films, video games, and Japanese dubs of foreign films. In his early career, he voiced supporting characters in major series, with roles in 2017 including Father Jacob in Vatican Miracle Examiner. The following year, he took on various roles such as Kong in Banana Fish, Ensign Nakanishi in Sword Art Online: Alicization, and numerous characters in the third season of Attack on Titan. He also appeared in My Hero Academia during this period, a franchise he has continued to contribute to in subsequent seasons.

In 2020, Sumi voiced the character Ikuzō Kumaneko in the series Tomica Kizuna Gattai Earth Granner. His work in the early 2020s includes roles as a doctor in To Your Eternity, a command figure in The World's Finest Assassin Gets Reincarnated in Another World as an Aristocrat, and multiple characters in the 2022 web anime Shenmue the Animation, including Dou Niu. His filmography continued to expand with parts in popular series such as Jujutsu Kaisen, where he voiced Takeshi Iguchi, and Hell's Paradise. He has also lent his voice to theatrical animated features, including Weathering With You, Mobile Suit Gundam Hathaway, and Suzume. Beyond original animation, Sumi is active in dubbing, providing Japanese voices for characters in international productions like the films Oppenheimer, Soul, and the television series The Simpsons.

Sumi is also notable for his deep interest in physical fitness, with reported personal bests of 170 kilograms in the bench press and 250 kilograms in the deadlift. He has expressed an aspiration to be known as the top muscle-focused voice actor in the industry. His other hobbies and skills include origami, providing personal training guidance, practicing waterfall meditation, chanting Buddhist sutras, and caring for reptiles.