Nico Márquez is Diego, Daisy, & Alicia's father who appeared on Go, Diego, Go! He is Miguel's younger brother and Valerie's youngest son and Elena's brother-in-law and Dora, Isabella, and Guillermo's Uncle. He is also Sabrina's husband.
Nico encourages Diego in a lot of rescues. In Diego's International Rescue League, it is revealed that he's a trained world animal rescuer. Papi has a close relationship with Diego, as in the same episode he had faith in his son. Papi has a lot of phrases that Diego tells the viewers such as: Ayuda todos los animales, Diego (You should help all the animals, Diego) Mi casa es su casa (My home is your home) Los animales pertenecen en su hogar natural (Animals from the wild belong in their homes in the wild) Los mejores amigos son los que se ayudan (Friends who help friends are the best friends of all) He is voiced by Sebastian Arcelus.
Nico has peach-brown skin, brown eyes, and black hair. He usually wears a blue t-shirt with a tan vest, khaki cargo shorts, white socks, and gray and brown shoes. In Dora the Explorer, he wore a green long-sleeved shirt with a light yellow collar, a brown belt with a silver buckle, brown slacks, and brown loafers. In Diego's International Rescue League, he wears a blue polo shirt with the Rescue League Logo on it, a white undershirt, and brown cargo shorts. His shoes remain unchanged.