Sixnalie Villalba is a Venezuelan voice actor, locutor, and interpreter who began her career in 2014 as part of a new generation of voice actors in Venezuela. In 2018, she relocated to Chile, where she worked as a producer until the end of 2019 and continues to work as a voice actor for the Santiago-based studio DINT Doblajes Internacionales.

Villalba is widely recognized for her leading roles in anime series and films. She voices the protagonist Rebecca Bluegarden in the anime adaptation of Hiro Mashima's Edens Zero, a role produced by DINT Doblajes for Netflix and later for Anime Onegai. She also provided the voice for Hiroka Betsuyaku, also known as Eroh, in the critically acclaimed animated film Belle. Her anime film work further includes a role in Maquia: A Story of Eternal Love and additional voices in Words Bubble Up Like Soda Pop. In addition to these, her anime credits include Nanami Nanaboshi in the series Obsolete.

Beyond anime, Villalba has an extensive career in dubbing for a wide variety of animated series. Notably, she has been the voice of Karen, Plankton's computer wife, in the Latin American Spanish dub of SpongeBob SquarePants since the show's tenth season. She is also known for taking over the role of Stella in the eighth season of Winx Club, a part she records in Chile. Her other prominent roles in animation include Carrie in Total Drama Presents: The Ridonculous Race, multiple characters in the DC Super Hero Girls franchise (including Barda and Batgirl), and several voices in the Latin American dub of Paw Patrol, such as Tracker and Liberty.

Villalba's career is marked by recurring collaborations with the studio DINT Doblajes Internacionales in Chile, where she works alongside a stable of other voice actors on numerous projects. For instance, in Edens Zero, her work frequently overlaps with actors like Felipe Vidal (Shiki Granbell) and Lucía Suárez (Happy). Her professional achievements include a long-running role in a globally recognized series like SpongeBob SquarePants and lead roles in major anime productions such as Edens Zero and the feature film Belle, demonstrating her range and standing in the Latin American dubbing industry.