A suit actor (スーツアクター, sūtsu akutā) is a member of, usually, a Japanese tokusatsu production who works similar to a stunt performer. However, the suit actor does all of his or her stunts while in a full costume that normally obscures their identity from the viewer (typically the transformed character) and performs pantomime, as an actor's voice will generally be dubbed during after-recording process (アフレコ, afureko).
List of suit actors
References
Suit actor Wikipedia(Text) CC BY-SA