Sayaka Harada is a Japanese voice actress born on December 23, 1997, in Chiba Prefecture. She decided to pursue a career in voice acting during high school and entered a training school in 2015. Her professional debut followed in the same year.

Harada's early career was marked by a notable breakthrough in 2016 when she was cast as Miyu Mifune in the popular game and anime franchise The Idolmaster Cinderella Girls. At the time of her casting, she was an unknown talent, which generated significant online interest and brought her widespread attention. Her first leading role in a television anime series came in 2017 as Chiya in Urara Meirocho. That same year, she also voiced the character Ai-chan in the original net animation Tawawa on Monday, performing its ending theme song.

Throughout her career, Harada has been affiliated with several agencies. She was initially with Clare Voice, becoming a permanent member in January 2019 before leaving at the end of July that same year to work as a freelancer. In January 2020, she joined V-FORK. As of January 2025, she became a freelancer once again following the conclusion of V-FORK's voice actor management operations.

Harada has built an extensive portfolio of roles across anime, games, and other media. Among her most recognized performances are the many characters listed in the query. This includes Kristina in Ancient Girl's Frame, Mimika Washizaki in UzaMaid!, Nozomi Takamagahara in Planet With, and Miyu Mifune in The Idolm@ster Cinderella Girls series. She is also the voice of Halkara in I've Been Killing Slimes for 300 Years and Maxed Out My Level and its sequel, and Miharu Ayase in Seirei Gensouki - Spirit Chronicles. Her other notable anime roles include Ai-chan in Tawawa on Monday and its second season, Dunkirk in Azur Lane: Slow Ahead!, Kikuko Gotō in Iwa-Kakeru! -Sport Climbing Girls-, Chitose Nakai in Yuuna and the Haunted Hot Springs, and Kusumi Egawa in Assault Lily Bouquet. She has also appeared in major franchises such as A Certain Magical Index III as Villian, Last Period as Mizaru, and Do You Love Your Mom and Her Two-Hit Multi-Target Attacks? as Porta. More recently, she voices Ayane Okusora in the Blue Archive: 1.5th Anniversary Short Animation and its subsequent anime adaptation, and has played Shinobu Yūki in UQ Holder! Magister Negi Magi! 2.

Beyond these roles, Harada has demonstrated recurring collaborations with specific franchises. She has a long-standing association with The Idolmaster: Cinderella Girls, voicing Miyu Mifune across multiple games, anime seasons, and animated specials. She has also consistently voiced characters in the Blue Archive game and its anime adaptations, and the I've Been Killing Slimes for 300 Years franchise, including its drama CDs. Her work in video games is extensive, with roles in major titles such as Azur Lane as Dunkirk and Haruna, Princess Connect! Re:Dive as Ranpha, and Granblue Fantasy.

In addition to her voice acting, Harada has contributed to music, performing character songs and theme tracks for several of her series. Notable examples include the opening theme for Urara Meirocho and the ending theme for the first Tawawa on Monday anime. She has also hosted radio programs, such as "Harada Sayaka no Sayanoma," demonstrating her engagement with fans beyond recording studios. Her personal interests include早起 (early rising), walking, reading aloud, and she has a fondness for tomatoes and traditional Japanese sweets.