Natsumi Hioka is a Japanese voice actress born on July 15, 1991, in Hokkaido, Japan. She is affiliated with the talent agency Production Baobab. Her interest in a career in voice acting developed during high school after watching late-night anime, including series such as The Melancholy of Haruhi Suzumiya, Macross Frontier, and Eden of the East. Inspired by the performances of voice actors like Kimura Ryohei and Hayami Saori, she convinced her parents to allow her to move to Tokyo, where she enrolled in a vocational school for voice acting training.

Hioka's entertainment career began in October 2011 as a co-host on the cultural broadcasting radio program Chō! A&G+ Digista. She made her debut in animated television series in 2012 with a role in The Ambition of Oda Nobuna. Her first leading role came in 2016, when she was cast as Machi Amayadori in the series Kuma Miko: Girl Meets Bear.

Over the course of her career, Hioka has built an extensive list of credits in anime television series. Among her notable roles are several of those listed in the query, though some name variations exist. She voices Hinaichi in The Vampire Dies in No Time and reprises the role for its second season. She is cast as Koharu Minagi in Slow Loop. In Armed Girl's Machiavellism, she plays Tsukuyo Inaba. Her role as Alka in Suppose a Kid From the Last Dungeon Boonies Moved to a Starter Town is confirmed as the character Aika. She voices Pam-Pam in Delicious Party Pretty Cure and appears as the character Shii Eniwa in Super Cub, credited as Shii Eniwa. Hioka also lends her voice to Amaha Shiratomi in Re:Stage! Dream Days, Himeno Ayanokouji in Love Live! Nijigasaki High School Idol Club, and Akane Shida in Osamake: Romcom Where The Childhood Friend Won't Lose. In High School Prodigies Have It Easy Even In Another World, she is cast as Shinobu Sarutobi. Additional significant anime roles include Kotoha in Mitsuboshi Colors, Machi Amayadori in Kuma Miko, and Miyabi Murosaki in Onimai: I'm Now Your Sister!.

Beyond television, Hioka has contributed her voice to several original video animation (OVA) projects and numerous video games. Her game credits include Mai Nikotama in Alice Gear Aegis, Akiha Yuki in Idol Kakusei, and the characters Hamakaze and Tanikaze in Azur Lane. She has also been involved in music performance related to her anime roles, singing character songs for series such as Witch Craft Works and Kuma Miko.

Hioka has shared that her personal interests include gourmet food exploration, taking walks, and creating handmade rubber stamps. She is also skilled in gymnastics. She has expressed a desire to take on roles with greater depth, beyond simply cute or comedic characters.