Risa Mizuno is a Japanese voice actress and scriptwriter born on November 3, 1978, in Kanagawa Prefecture, Japan. She is a graduate of the Faculty of Literature's English Literature department at Sophia University. Her career in voice acting began in the year 2000, with her debut role as Nae Akihabara in the television anime series Medarot Damashii. She is affiliated with the talent agency OgiPro THE NEXT and is an active member of the theatre company Shonan Teatro Dellarte.

Mizuno has built a career with a wide variety of voice roles in anime, video games, and film. Her filmography includes many of the specific titles referenced, such as Huang Yingying in Aguu: Tensai Ningyō, Julie (Jevina) in the Bakugan Battle Brawlers series, Ethana in The Tower of Druaga: the Sword of Uruk, Maki Kasahara in The Place Promised in Our Early Days, and Claes in Gunslinger Girl: Il Teatrino. She also voiced the character Lulu across multiple entries in the Sylvanian Families: Mini Story franchise.

Beyond these specific roles, Mizuno is recognized for several other notable performances. She voiced Najenda in Akame ga Kill!, Lia de Beaumont in Le Chevalier D'Eon, Saori Nikaidō in Shion no Ō, Wakana Nura in Nura: Rise of the Yokai Clan, Yuma Saihashi in Code-E, and Shout in Bomberman Jetters. She has also had recurring roles in long-running franchises, including various characters in KochiKame: Tokyo Beat Cops and Julia in the Kyo Kara Maoh! series. In addition to television work, Mizuno has lent her voice to several acclaimed animated films directed by Makoto Shinkai, including The Place Promised in Our Early Days, 5 Centimeters per Second, and The Garden of Words.

Mizuno's talents extend beyond voice acting. She is also a scriptwriter, working under the pseudonym Aki Mizuki (or Shuu Mizuki). In this capacity, she has contributed scripts for the anime adaptations of Arknights and the original anime series One Strike. Furthermore, she maintains a strong connection to live theatre, frequently performing as a leading actress in productions by the Shonan Teatro Dellarte company, of which she is a core member.