Chiyo Tomaru is a Japanese voice actor from Saitama Prefecture, born on September 28, 1991. She is affiliated with the talent agency EARLY WING and is a graduate of the Tokyo Animator Academy. Her path to voice acting was influenced by an initial desire to become an actress, though she chose to pursue voice work due to a reluctance to perform on stage.

Tomaru's career began in the early 2010s with minor roles in various anime series. A significant breakthrough role came in 2015 when she was cast as Noriko Shiina in the popular mobile game The Idolmaster Cinderella Girls, a role she would reprise in the subsequent anime series The Idolmaster Cinderella Girls Theater and related music releases. This character, an energetic girl who loves donuts and aspires to be an idol, became one of her most recognized performances. Her involvement with the Idolmaster franchise is extensive, including singing on multiple character song CDs and participating in live concert events.

Another notable role is Delia in the anime series Ascendance of a Bookworm. She joined the cast for the second part of the series, which aired in 2020, voicing a gray-robed cleric who serves the main character, Myne. Tomaru also voiced the character Chiyo Izumi in the 2021 web anime Inō no Aicis.

Beyond these prominent roles, Tomaru has built a diverse portfolio of voice work in both anime and video games. Her anime credits include roles in Ordinary Girls' Local Idol Endeavor! and Gon. In the realm of video games, she has lent her voice to characters in titles such as Racing Girls, Death end re;Quest, and Azur Lane. She is also known for providing narration and voice work for commercials and other media, such as the morning call messages for the Akihabara Washington Hotel.

Tomaru has a recurring collaboration with fellow voice actor Rika Yanagihara, with whom she co-hosted the internet program "Tomaru Chiyo Yanagihara Rika no Arekore!" starting in 2018. Her work is frequently tied to the Idolmaster franchise, where she collaborates regularly with other voice actors from the series on music and live performances. Her notable achievements include a sustained and active career in a competitive industry, with a particular stronghold in a major multimedia franchise, demonstrating her versatility across animation, games, and music.