Serina Machiyama is a Japanese voice actress affiliated with the agency AIR AGENCY. She was born on October 5th in Chiba Prefecture. Machiyama is a graduate of both the Japan Narration Acting Institute and the AIR AGENCY Voice Actor Training Center.

Her professional voice acting career began in the mid-2010s, with an early role in the 2017 anime series Isekai Shokudō. She gained wider recognition for her work in the long-running series My Hero Academia. Starting in 2018, she was cast as the voice of the Pro Hero Pixie-Bob, a member of the Wild, Wild Pussycats team, a role she has continued to reprise across multiple seasons of the show. In addition to Pixie-Bob, she also voices a recurring student character named Tamei Hiroshi in the same series.

Beyond her most prominent role, Machiyama has built an extensive portfolio of work in television anime, animated films, and video games. Her anime credits include appearances in series such as Golden Kamuy, Black Butler: Public School Arc, Re:Zero - Starting Life in Another World, and Blue Box. In film, her voice can be heard in productions like Gintama: THE FINAL and ARIA The Benedizione. She is also active in the video game industry, with roles in major titles including Final Fantasy VII Rebirth, Granblue Fantasy, and Monster Strike.

Machiyama is known among fans by the nickname Machiko. Her professional versatility is demonstrated by her work across various media, including digital comics and voice dramas, in addition to anime and games. She is noted for her cheerful and energetic persona, as well as personal interests that include cleaning, watching films, and making sweets.