Tsuyoshi Aoki is a Japanese voice actor born on May 30, 1977, in Tokyo, Japan. His career in voice acting began in the mid-2000s, with his earliest known anime roles appearing in series from 2005. Over the years, he has been affiliated with several talent agencies, including ARTSVISION and AS Planning, before becoming a freelance worker and eventually joining the agency Aksent.

Aoki is primarily known as a versatile supporting actor, frequently lending his voice to a wide array of side characters and guest roles in numerous anime series. His extensive filmography includes a notable role in the popular romantic comedy Toradora!, where he voiced multiple characters, including Ryuuji's grandfather and a mathematics teacher. He also contributed to the long-running historical anime Kingdom, providing voices for several characters such as the statesman Li Si and the general Long You. In the magical girl franchise, he played Daikichi Asahina in Witchy Precure!. Aoki has also made appearances in the science fiction series A Certain Scientific Railgun and its sequel, A Certain Scientific Railgun S, where he voiced members of the Skill-Out gang. His work extends to other well-known productions, including roles in AKB0048, Bodacious Space Pirates, and High School D×D.

Beyond original Japanese animation, Aoki has an active career in dubbing foreign films and television series, as well as voicing characters in video games. In the video game medium, he is recognized for playing the character Lubor in Final Fantasy XVI and Maximius in SaGa Scarlet Grace: Ambitions. For foreign live-action dubbing, he provided the Japanese voice for Emmett Cullen, played by Kellan Lutz, in the Twilight film series. He also voiced the character Luci in the Japanese dub of the animated series Disenchantment. In the realm of superhero animation, he took on the iconic role of Tony Stark, also known as Iron Man, in the Japanese dub of The Avengers: Earth's Mightiest Heroes. Additional dubbing work includes roles in popular television series such as Glee, where he voiced Noah Puckerman, as well as The Mentalist and Hawaii Five-0.

His career is marked by a high volume of work, demonstrating a consistent presence in the industry since the late 2000s. While he has not frequently played leading roles, he has become a familiar supporting presence, contributing to a vast number of major anime titles. His filmography showcases a steady stream of credits in prominent series, including The Sacred Blacksmith, Tokyo Magnitude 8.0, Canaan, Nodame Cantabile, and various installments of the Magical Girl Lyrical Nanoha movie series.