Nathalia Guillen is a Brazilian voice actor based in São Paulo, where she was born in 1989. She has been active in the dubbing industry since 2009, building a career that encompasses anime, live-action series, and films. Her work is primarily in the Brazilian Portuguese dubbing of international productions.

Guillen has lent her voice to a wide array of characters across different genres. In anime, some of her notable roles include Marin Kitagawa in My Dress-Up Darling and Tarō Misaki in Captain Tsubasa. She has also participated in the dubbing of other popular anime such as Dr. Stone, Fruits Basket, and Rick & Morty: The Anime. Her live-action dubbing work includes characters in the series This Is Us, Gen V, and Insatiable, as well as films like Jogos Mortais III and Contágio: Epidemia Mortal.

In the realm of anime, she is specifically recognized for voicing the character Chuck in the series Beyblade Burst Sparking, known as Beyblade Burst: Surge in its Brazilian release. Her versatility extends to the tokusatsu genre, where she was announced as the voice of the character Nem in the Brazilian Portuguese version of Kamen Rider Zeztz, a role that highlights her ability to handle characters with both charismatic and mysterious dimensions. Beyond performing, she also works as a dubbing director, showcasing her broader expertise in the field of voice localization.