Guilherme Briggs is a highly acclaimed Brazilian voice actor, dubbing director, and translator, widely regarded as one of the foremost talents in the Brazilian dubbing industry. Born on July 25, 1970, in Rio de Janeiro, he began his career in voice acting in 1991 and has since become known for lending his voice to a vast array of iconic characters across animation and live-action.

His extensive portfolio includes numerous prominent roles in anime and anime-related productions. He voices the skeletal musician Brook in the One Piece franchise, including the films One Piece Stampede and One Piece Film Red. In the fantasy series The Ancient Magus' Bride, he portrays the enigmatic magus Elias Ainsworth. Briggs also takes on the role of Gibbs in the Netflix anime Drifting Dragons and voices the lead character Johnny Bolt in the superhero anime Super Crooks.

Briggs has a notable association with the role of Optimus Prime, having voiced the character in several Transformers series, including Transformers: War for Cybertron Trilogy: Siege, Transformers: Armada, and Transformers: Robots in Disguise. He is also the voice of the powerful Pokémon Mewtwo in the CGI film Mewtwo Strikes Back Evolution. In the popular My Hero Academia franchise, Briggs voices the legendary hero All Might in films such as My Hero Academia: Two Heroes and My Hero Academia the Movie -Heroes: Rising-. Other anime roles in his career include Kaname Mozunoto in 7SEEDS and Radamathys de Wyvern in Saint Seiya: The Hades Chapter - Sanctuary. He also voices Cyborg 008 in Cyborg 009 The Cyborg Soldier and Larry Markson in the 2022 ONA adaptation of Spriggan.

Beyond his work as a voice actor, Briggs is active as a dubbing director, with credits including the Brazilian Portuguese versions of Avatar, Watchmen, and Despicable Me. His contributions to the field have been recognized with numerous accolades, including a Crunchyroll Anime Award in 2024 and multiple Prêmio Yamato awards, which are considered the highest honor in Brazilian dubbing.