Eri Sendai is a Japanese actress and voice actress born on October 30, 1981, in Tokyo, Japan. Her career in the entertainment industry began at a young age when she joined the Himawari Theatre Group in 1989, initially working as a child actress in television dramas and variety shows. She made her voice acting debut in 1997 in the original video animation series Jungle de Ikou!. Over the years, she has been affiliated with several talent agencies, including Tokyo Actor's Consumer's Cooperative Society and Production Baobab, before eventually founding her own agency, Green Note, in August 2020. In addition to her voice work, she has also served as a special lecturer at the Japan Institute of Creative Arts.

Sendai is known for a wide range of voice roles across many anime series and films. She has a significant and long-standing connection with the Pretty Cure franchise. She is particularly well-known for voicing the character Milk, also known as Kurumi Mimino and her alter ego Milky Rose, a role she originated in Yes! Precure 5 and reprised in its sequel Yes! Precure 5 GoGo!. Her portrayal of this character extended to numerous Pretty Cure All Stars crossover films, including Precure All Stars DX: Minna Tomodachi—Kiseki no Zenin Daishūgō, Precure All Stars DX2: Kibō no Hikari—Rainbow Jewel o Mamore!, Precure All Stars DX3 Mirai ni Todoke! Sekai o Tsunagu Niji-Iro no Hana, and Eiga Precure All Stars New Stage 3: Eien no Tomodachi. She also voiced Shiho Kubota in the original Futari wa Pretty Cure series.

Another prominent role in her career is Caesar (born Suzuki Yoshiko) in the popular military-themed series Girls und Panzer, a part she has played in the television series, the film Girls und Panzer der Film, and the multi-part sequel Girls und Panzer das Finale. She is also recognized for her work as Runo Misaki in the Bakugan Battle Brawlers franchise. Her filmography includes the role of Toka Takanashi in Love, Chunibyo & Other Delusions!, Shizuku Ishiki in King of Thorn, Kourin in The Story of Saiunkoku, and Arika in Medarot Damashii.

Other notable credits include Panna in Nepos Napos, Samantha in Kupū~!! Mamegoma!, Michiru Sendo in Top Secret ~The Revelation~, Yukiko Arashiyama in And Yet the Town Moves, Fumika Mikawa in Shigofumi - Letters from the Departed, and Lady Mizuki in Lady Jewelpet. She also voiced Ayumu Oume in Best Student Council, Natsume in Jungle de Ikou!, POM in Halo Legends, and Michi Kuroki in Nora, Princess, and Stray Cat. Her role as Chiyo in the OVA series Freedom is also part of her extensive body of work.

A notable achievement in Sendai's career is her enduring association with the Pretty Cure franchise, where her character became a staple in the annual all-star crossover films for several years, cementing her place within that fan community. In addition to her on-screen roles, she has worked extensively in video games, often using the adult pseudonym Sora Haruka. Beyond performing, she has taken on entrepreneurial and mentorship roles within the industry, founding her own agency, Green Note, and working as an instructor for voice acting.