Ivana Baquero
11 years old at the time of production, Baquero is a Spanish actress who made her film debut in this movie, although she had been acting since the age of eight, predominantly in small roles on both stage and television. For her performance, she was awarded the Goya Award for Best New Actress, a Saturn Award, and a Turia Award.
In 2015 she joined the cast of the MTV Network's adaptation of The Shannara Chronicles. Her other films include The Anarchist's Wife, The New Daughter, Another Me, and The Misfits Club.
Sergi Lopez
Sergi Lopez is a Spanish actor, best known in America for his work in the film Dirty Pretty Things. His other films include Caresses, Solo mia, The Milk of Human Kindness, To Paint or Make Love, Happy End, Ricky, A Perfect Day, and The Man Who Killed Don Quixote.
Doug Jones
Jones, an American actor, contortionist, and mime had already worked with del Toro twice when he was cast in the roles of The Faun and The Pale Man, most notably on Hellboy. His other films include Mimic, Crimson Peak, The Shape of Water, Hocus Pocus, Tank Girl, and Absentia.
Maribel Verdu
Maribel Verdu is a Spanish actress perhaps best known for her performance in Alfonso Cuarón's Y Tu Mamá También. Her other films include Lovers, Belle Epoque, Los Girasoles Ciegos, and Blancanieves. She has been nominated for a Goya Award 11 times in her long career.
Ariadna Gil
Ariadna Gil is a Spanish actress. Her films include Living Is Easy with Eyes Closed, Sólo Quiero Caminar, Appaloosa, Alatriste, Belle Époque, and Lágrimas Negras.