The Legend of Vox Machina, an animated adaptation of the popular tabletop series Critical Role, has introduced a unique twist in its fourth season by making Matthew Mercer, the Dungeon Master, a canonical character within the show. Mercer voices a character that resembles himself, marking a notable distinction from his fellow cast members who voice their original characters. The series features nine main voice actors, including Liam O'Brien, Laura Bailey, and Travis Willingham, who reprise their roles from the tabletop series. Season 4 sets a new narrative direction, showcasing Vex and Percy living a life of nobility in Whitestone. Throughout the series, Mercer has voiced various non-playable characters (NPCs), including primary antagonists and allies. In addition to his role in The Legend of Vox Machina, Mercer is a prolific voice actor known for his work in anime and video games, with notable roles such as Captain Levi in Attack on Titan and Jesse McCree in Overwatch.