Mariette Sluyter is a Canadian voice actor known for her work in English dubs of anime series, primarily recorded at Blue Water Studios in Calgary, Alberta. Her career in voice acting began after she had already trained and worked in theatre. A director at a commercial audition suggested she pursue voice work, leading her to follow up with commercial voiceovers. When an anime studio came to town, she auditioned and secured her first roles in the industry, which she recalled as being either for Saber Marionette J or Jubei-chan.

Sluyter's professional background includes formal training in acting and vocal performance, skills she leveraged to build a career with over a decade of experience in commercial voiceovers, animation, and ADR. She is described as a versatile performer capable of delivering a wide range of character voices, from scrappy boys and petulant children to sassy young women and tough characters.

Among her most recognized anime roles is Midori Sugiura in the popular series My-HiME and its successor, My-Otome, where she voiced the character's alternate universe counterpart, Aswad Midori. She has expressed particular enjoyment in playing strong characters and appreciated the opportunity to portray an adult role with a feisty and practical nature. Another notable performance is her role as Roulette Boy in the cult classic series Gregory Horror Show and its follow-up, Gregory Horror Show: The Last Train. Her other significant anime voice credits include Shoko in Jubei-Chan: The Ninja Girl - Secret of the Lovely Eyepatch, Akane Kobayashi in Doki Doki School Hours, and Sakura in Betterman. She also voiced a character in Angel Links and was part of the cast for Saber Marionette J to X.

Throughout her career, Sluyter has frequently collaborated with a consistent group of voice actors and directors based in the Calgary voice-over community. She has worked alongside actors such as Dave Pettitt, Jonathan Love, Carol-Anne Day, and Dave Kelly on numerous projects. She has noted the collaborative and sometimes humorous atmosphere in the recording studio, particularly when working with other actors on projects with raw scripts rather than direct dubs. In addition to her anime work, Sluyter has extensive experience in commercial voiceovers, lending her voice to campaigns for companies such as WestJet, Subaru, Ford, and Toyota. Her professional approach and vocal flexibility have earned her recognition from directors for her believable performances and strong script interpretation.