Ayaka Shimoyamada is a Japanese female voice actor affiliated with the talent management firm Ken Production. She was born on December 28, 1988, in Kanagawa Prefecture. Information regarding her date of birth differs in some community-edited sources, which list only July 8. She began her voice acting career in 2011, with early roles including a minor part in the anime series "Gintama'" and providing voice for an office lady in "Sekai-ichi Hatsukoi 2".

Her career encompasses a wide range of roles in Japanese animation, video games, and foreign language dubbing. In anime, she has appeared in productions such as "Space Brothers," "Kids on the Slope," "Psycho-Pass 2," and "JoJo's Bizarre Adventure: Stardust Crusaders". A notable role came in 2019 when she voiced the characters Frase and the Little Mermaid in the television anime series "Bermuda Triangle: Colorful Pastrale". In the realm of web anime, she is known for her role as Mei in the 2021 Netflix original series "Pacific Rim: The Black". Her work in original video animation (OVA) includes the 2024 project "Deliver Police: Northgate".

A significant portion of Shimoyamada's career is dedicated to voice-over work for foreign films and television series, a field known as fukikae. Her dubbing credits are extensive and include a diverse array of characters. She has provided the Japanese voice for actors in major Hollywood films such as "Alien: Covenant" (Upworth), "Call Me by Your Name" (Marzia), "Kingsman: The Secret Service" (Roxy), and "X-Men: Apocalypse" (Jubilee). She also voices characters in foreign animated series, including Sypha Belnades in the animated series "Castlevania" and Eyes in "Spies in Disguise".

According to her agency profile and community resources, Shimoyamada lists character design and collecting movies as her hobbies and special skills. She has also been noted for having a voice with a certain shadowy or nuanced quality, which she aims to utilize in her performances regardless of the character type. She is an avid gamer, having been influenced by playing with her older brother since childhood. In addition to acting, she has experience as an assistant on the radio program "BE YOURSELF" and appeared on the television program "Seiyuu Tantei Riddle Heart" in 2013.