Mio Hoshitani is a Japanese voice actress born on January 2nd in Yamanashi Prefecture. She is affiliated with the talent agency Tokyo Actor's Consumer's Cooperative Society. Her interest in animation was sparked during elementary school after watching the anime Shaman King, and she decided to pursue a career as a voice actress from middle school onwards. She began her professional activities in 2016.

Hoshitani's early career included minor and supporting roles in series such as Uta no Prince-sama: Legend Star, Girlish Number, and怪盗Joker. Her first recurring role was as Urara in the LALALA LALA-CHAN series from 2016 to 2017. A significant turning point in her career came in 2018 when she was chosen to succeed Ayaka Imamura as the voice of Mayano Top Gun in the popular multimedia franchise Uma Musume Pretty Derby. This role became her most prominent to date, and she has continued to voice the character across multiple anime seasons, OVAs, web animations, and game projects.

In addition to her work on Uma Musume, Hoshitani has built a diverse portfolio of voice roles. She voiced the character Zonne in the 2019 anime series Z/X Code reunion, based on the trading card game. Her other anime credits include roles in异世界食堂 (異世界食堂), Toaru Kagaku no Railgun T, and Toaru Kagaku no Accelerator. In the realm of video games, her work spans numerous titles, including Sharon in 誰ガ為のアルケミスト (誰ガ為のアルケミスト), characters in Monster Strike, and Aina Mizuhara in Heaven Burns Red.

Hoshitani is also known for her recurring collaborations within specific franchises. Beyond her longstanding role in the Uma Musume series, she has been deeply involved with the Z/X franchise. She is a member of the official voice actress unit Ignition Girls, which later evolved into the five-member idol group SHiFT within the Z/X universe, contributing to character songs and live performances. Her musical contributions as a singer extend to various anime and game albums through character songs.

A notable achievement in her career was smoothly taking over the role of Mayano Top Gun, a major character in an established hit series, which garnered recognition from fans and within the industry. Her versatility extends beyond anime and games to include radio hosting, having co-hosted programs such as Mushamusha Communications with Kyoka Moriya on the internet radio station Onsen, as well as participating in drama CDs, ASMR projects, and live reading events. For adult-oriented works, she uses the pseudonym Tsukishiro Mahiru.