Ria Koito is a Japanese voice actor and VTuber. She was born on January 18th. Her career in the entertainment industry began under a different persona, as she originally gained prominence as the VTuber Mikeneko, amassing a significant online following. In June 2023, she signed with the VTuber agency Voice-Ore, and it was at this time that she adopted the new professional alias of Ria Koito.

As Ria Koito, she made her debut as an anime voice actor. Her first and most prominently known role is providing the voice for the character Lilium in the short-form anime series Isekai Onsen Paradise, which premiered in January 2024. Lilium is an elf girl from another world who initially clashes with the protagonist over a hot spring before becoming a friend to the visitors from Earth. This role marked her entry into anime voice acting.

Alongside her voice acting debut, an artist debut with the music label Pony Canyon was planned for spring 2024 under her new name. However, this project was later canceled due to production issues. Her time with the agency Voice-Ore concluded when the company announced it would disband at the end of June 2024, after which she, like the agency's other talents, continued her activities independently.