Keigo Hoshino is a Japanese actor, voice actor, and entertainer from Tokyo, Japan. He is affiliated with the talent agency LEOPARD STEEL. His career began in live theatre, and he was also a member of the male idol group H@ng_oveR and is part of the performance unit team DICE☆K. In 2019, he restarted his stage activities with the goal of focusing more on his career as an entertainer, subsequently becoming a业务合作 (business partnership) member of LEOPARD STEEL through the Shoto Actor's Gymnasium before officially joining the agency on April 1, 2020. This transition marked a significant step into voice acting, building on his previous experience in stage performances.

As a voice actor, Hoshino has built a portfolio of roles in anime, video games, and live-action television. One of his credited voice roles from this period is Tōto Higuma in the 2020 web anime series Onegai Patron-sama!. His other anime voice work includes roles in productions such as the film Hello World (2019), the film Belle (2021), and the television anime Backflip!! (2022). He has also contributed voices to the anime adaptation of the game series Sword Art Online, in projects like Sword Art Online: Alicization – War of Underworld (2020) and the film Sword Art Online Progressive: Scherzo of Deep Night (2022).

Beyond animation, Hoshino's voice acting work extends to video games, with credits in titles such as Shining Beyond (2021) and The King of Fighters All Star (2022). He has also appeared in live-action television, including a role in an episode of the Super Sentai series Mashin Sentai Kiramager (2020). Hoshino holds a certified professional trainer license from the MGA organization, and his listed hobbies and skills include board games, watching foreign television dramas, and partner stretching.