Takashi Hagino is a Japanese actor and voice actor born on May 27, 1973, in Tokyo, Japan. His career in the entertainment industry began in 1991, and he has since become known for his work across television, film, and stage, particularly within the tokusatsu genre of special effects productions. Standing approximately 182 cm tall with blood type B, he has maintained a consistent presence in Japanese popular culture, often portraying intense and memorable characters.

As a voice actor, Hagino is best recognized for his leading role in the 2004 anime series Yugo the Negotiator, where he voiced the protagonist Yugo Beppu. This character is a professional negotiator who resolves dangerous situations using only his words and psychological insight rather than violence. The series, based on the manga by Shinji Makari, marked a significant expansion of Hagino's career into voice performance, demonstrating his ability to carry an anime production in a lead role.

In addition to his anime work, Hagino has contributed his voice to the Kamen Rider franchise in other capacities. He provided the voice of the Cobra Imagin in the 2007 film Kamen Rider Den-O: I'm Born!. This role is notable as it features him as a voice actor for a fully computer-generated character, distinct from his more famous on-screen portrayal of Takeshi Asakura.

Hagino is most famous for his live-action role as the villainous Takeshi Asakura, also known as Kamen Rider Ouja, in the 2002 to 2003 series Kamen Rider Ryuki. His performance as the psychopathic and ruthless Asakura became iconic within the fandom, leading him to reprise the character numerous times across films, specials, and later series. These reprisals include the movie Kamen Rider Ryuki: Episode Final, the special Kamen Rider Ryuki Special: 13 Riders, the web series Kamen Rider Outsiders, and the crossover film Kamen Rider Geats × Revice: Movie Battle Royale. He has also appeared in later installments such as Kamen Rider Decade. Before his fame in Kamen Rider, he played the lead role of Akira Suzumura, the hero Changerion, in the 1996 tokusatsu series Choukou Senshi Changérion.

Throughout his career, Hagino has been affiliated with Nagara Production but has worked as a freelance actor since approximately 2018. His stage work includes productions such as Blue Exorcist the Stage and Vinland Saga the Stage, further showcasing his range as a performer. He has also released a music single and a travel DVD, demonstrating creative interests beyond acting. Among colleagues on the set of Kamen Rider Ryuki, he was affectionately called Aniki, a Japanese term for an older brother or respected senior figure.