Marcos Souza is a Brazilian voice actor known for his work in dubbing anime and animated series into Portuguese. He has provided the Brazilian Portuguese voice for a variety of characters across different productions, many of which have been available on streaming platforms.

In the anime series Great Pretender, Souza voiced the character Laurent Thierry, a suave and expert international con man. The character's original Japanese voice was provided by Junichi Suwabe. Souza's portrayal contributed to the Brazilian dubbed version of this Wit Studio production.

For the Netflix anime series 7SEEDS, based on the manga by Yumi Tamura, Souza was the voice of Arashi Aota. Arashi is a member of the Summer Team B, one of the groups of teenagers awakened to survive in a post-apocalyptic world. The character's Japanese voice actor is Jun Fukuyama.

Souza also voiced the character Dan Moroboshi, also known as the hero Seven, in the 2019 CGI anime series Ultraman. This series is a continuation of the classic Ultraman franchise and was also released by Netflix. In this role, he voiced the seasoned Ultraseven, with Takuya Eguchi providing the original Japanese voice. The Brazilian dubbing for this series was handled by BTI Studios.

In the anime Oban Star-Racers, a French-Japanese co-production, Souza voiced the character Koji. Koji is the co-mechanic and electronics specialist for the Earth Team, known for his shy nature and quick thinking. The dubbing for this series was directed by Fernanda Baronne at the Herbert Richers studio in Rio de Janeiro.