Tomomi Jiena Sumi is a Japanese voice actress, singer, and performer known for her work in anime, video games, and music franchises. Born on September 5, 1994, in Kyoto, she is of Japanese and Filipino descent. Her interest in voice acting was sparked by watching Jackie Chan movies dubbed in Japanese and observing the differences in voice acting between English and Japanese programs on the Disney Channel.

Sumi's career in entertainment began in music and live performance. In October 2013, she became a member of the official Toei tokusatsu group Kamen Rider Girls, performing theme songs and appearing at live events for the Kamen Rider franchise. Her voice acting debut came in 2017 with a role in the game Schoolgirl Strikers: Twinkle Melodies. She made her anime debut in 2019, voicing the character Rina in the television series Kemurikusa.

Sumi has built a diverse portfolio of roles across various media. In anime and related projects, she is known for voicing An Shiraishi in the Colorful Stage! franchise, including the mobile game Project SEKAI COLORFUL STAGE! feat. Hatsune Miku and the film COLORFUL STAGE! The Movie: A Miku Who Can't Sing. She also voices Rin Takagi in the mixed-media project Utahime Dream. Her other anime credits include minor roles in series such as Go! Go! Loser Ranger!, FUUTO PI, and BanG Dream! It's MyGo!!!!!.

Her work in video games is extensive. Beyond Project SEKAI, she has voiced characters in major titles like Yakuza: Like a Dragon, Granblue Fantasy, Blue Archive, and the Touhou Project game Touhou Gensou Eclipse. She also joined the D4DJ Groovy Mix franchise in 2022 as the voice and performance artist for the character Elsie in the unit Abyssmare.

Recurring collaborations are a notable feature of her career. Her long-standing involvement with the Kamen Rider Girls is a central thread, which has included live-action roles such as portraying Masako Suzuka, also known as Kamen Rider Sylphi, in a Gaim Gaiden special. She is consistently involved with music-focused projects that combine voice acting and singing, such as Project SEKAI's Vivid BAD SQUAD unit, Utahime Dream, and D4DJ. In 2019, she joined Team BareboAt, a private acting workshop led by fellow voice actress Megumi Ogata.

Among her notable achievements, Sumi was a finalist in the Avex × SHOWROOM Voice Actor Artist Audition in 2016, which helped showcase her vocal and performance abilities. Her work with Kamen Rider Girls has involved performing insert songs and theme songs for multiple Kamen Rider series, including Kamen Rider Gaim, Kamen Rider Drive, and Kamen Rider Build. As part of Utahime Dream All Stars, she performed the ending theme song for the 2024 anime I Parry Everything.