Shio Kisui is a Japanese voice actress and singer from Tokyo, born on March 28, 1998. She began her entertainment career in 2014 after being a runner-up in the first National Beautiful Voice Contest, a competition organized by Oscar Promotion and Aoni Production. Initially, she performed under the name Mii Takahashi and was a founding member of the idol group elfin' from 2015 to 2017. After leaving the group and her agency, she took a hiatus before joining the agency BLACK SHIP as a trainee in 2021, adopting her current stage name, Shio Kisui, to begin a focused career as a voice actress.

Her most prominent and high-profile role is providing the voice of Yuika Mitsumine in the popular mixed-media franchise The Idolmaster Shiny Colors. She took over the role in 2022 as the character's second voice actor and has since voiced her in the franchise's various games, including The Idolmaster Poplinks and The Idolmaster Shiny Colors: Song for Prism, as well as its 2024 anime television adaptation. This role has become a central part of her career, leading to numerous related music releases and live concert appearances.

In addition to her work in The Idolmaster, Kisui has built a diverse portfolio of roles in both anime and video games. Her anime credits include minor roles in series such as My Hero Academia, RPG Real Estate, Shine Post, and The Dangers in My Heart. In video games, she voices Daring Heart in Uma Musume Pretty Derby and has appeared in titles like Guardian Tales and Kemono Friends.

Kisui is also active in musical theater, a passion that preceded her voice acting career. Her stage credits include ensemble roles in major productions like Les Misérables. She is scheduled to appear in the 2025 musical adaptation of Your Lie in April, playing the role of Tsubaki Sawabe. Her work is frequently centered on projects related to The Idolmaster: Shiny Colors, leading to repeated collaborations with other cast members from that franchise such as矶部花凛 (Karin Isobe), 永井真里子 (Mariko Nagai), and 白石晴香 (Haruka Shiraishi).