Other video game credits includes Jack Cooper in Titanfall 2, Chrom in Fire Emblem Awakening, McCree in Overwatch, MacCready in Fallout 4 and Yusuke Kitagawa in Persona 5.
Mercer also voices heavily in anime including the character Levi in the anime adaptation of the manga Attack on Titan, Sinbad in Magi: The Labyrinth of Magic Kiritsugu Emiya in Fate/Zero and Trafalgar Law in the Funimation dub of One Piece.
He also had a hand in many aspects of the web-series There Will Be Brawl (based on Super Smash Bros.), in which he not only voiced characters but was also responsible for directing, producing, visual editing and costume design. He also is a main member of the web show Critical Role, where he and several other voice actors, including wife Marisha Ray, play Dungeons and Dragons with him as the dungeon master. His co-star Laura Bailey, who portrayed Helena Harper is also on the show with her husband Travis Willingham.