Thiago Longo is a prolific Brazilian voice actor known for his extensive work in dubbing anime, television series, and films for the Brazilian Portuguese market. His career began in the year 2000, starting with an internship at the Álamo dubbing studio after a connection made through fellow voice actor Thiago Keplmaior. Prior to this, he had already appeared in television commercials and soap operas as a child actor.

Longo is perhaps best recognized for his many roles in popular anime series. He is the voice of Manta Oyamada, the intelligent and timid best friend of the protagonist in both the 2001 and 2021 versions of Shaman King. He also voiced the character Korapaika in the 1999 version of Hunter X Hunter and its subsequent OVAs. Another significant role is Rex Owen, one of the main characters in the series Dinosaur King and its second season. In the world of sports anime, he voiced Jun Misugi in Captain Tsubasa: Road to 2002 and Yuito Hoshina in Hoop Days.

His work spans a wide variety of other notable series. He voiced Takehiro Kai in Godzilla Singular Point and Aoba in BEASTARS. He has multiple roles in the Pokémon franchise, including Barry, Paul, and Conway in Pocket Monsters: Diamond & Pearl, as well as Drew in Pokémon Advance and Richie in Pokémon Chronicles. His credits also include Keigo Asano in Bleach, Eriol in Cardcaptor Sakura, Graham Aker in Mobile Suit Gundam 00, Tenga Onigawara in Mob Psycho 100, Noriaki Kakyoin in JoJo's Bizarre Adventure: Stardust Crusaders, and Killer in One Piece. In addition, he voiced Hiroto Honjō in the film Seven Days War, Hiead Gner in Pilot Candidate, Gus in Bakugan Battle Brawlers: New Vestroia, Dai Takabayashi in Super Doll Licca-chan, and Shin'ichi Handa in the Inazuma Eleven: Saikyō Gundan Ogre Shūrai film.

Beyond anime, Longo has voiced characters in numerous other projects. He is known for dubbing live-action roles, such as Troy, the Red Ranger, in Power Rangers Megaforce, a role he described as particularly meaningful due to his childhood fandom of the franchise. His other live-action dubbing includes Joe Jonas in the Camp Rock films and television series, and RJ Mitte as Walter White Jr. in Breaking Bad.

Over his career, which has spanned more than two decades, Thiago Longo has become a familiar and respected voice in Brazilian dubbing, contributing to hundreds of characters across a broad spectrum of genres and mediums.