Diego Márquez is Dora's cousin, though it's never confirmed how they're related. They're presumably first cousins, and considering they share the same last name, the most likely theory as to how their cousins is that they're dads are brothers. Like Dora, Diego comes from a family of three kids, with the three kids consisting of one son and two daughters. However, while Dora's the oldest kid in her family (her younger brother, Guillermo, and her younger sister, Isabella, are fraternal twins), Diego's the youngest kid in his family (he has two older sisters named Daisy and Alicia). While he's a minor character in his cousin's show, Diego's the host of his own show where he's the main character and Dora appears as a minor character in her cousin's show.
Diego has dark-tan skin and brown eyes. He also has brown hair and wears a light blue shirt with a tan vest, darker blue cargo shorts, white socks, gray shoes, and a blue and yellow watch. However, starting in the fourth season of his show Go, Diego, Go!, he wears a short-sleeved red sweatshirt with an orange top underneath, black cargo shorts, white socks, and black and red sneakers. Diego is seen wearing his previous outfit in a few flashbacks in the episode Fiercest Animals. In his debut, he wore a darker blue shirt with the same vest, green cargo shorts, green socks, brown shoes, and a silver watch.
Diego appears in several episodes of Dora the Explorer as well as every episode of Go, Diego, Go!. He had the major role except in "Alicia and Whitetail to the Rescue". His first appearance was in "Meet Diego!".
Diego has appeared on Dora the Explorer in the following episodes:
- Meet Diego!
- Baby Dino
- Baseball Boots
- Boots' Special Day
- To the South Pole
- Dora Saves the Game
- Dora's Pirate Adventure
- The Super Silly Fiesta
- Boots' Cuddly Dinosaur
- Job Day
- Daisy, La Quinceañera
- La Maestra de Musica
- Swiper the Explorer
- Big Sister Dora
- Catch the Babies
- Super Spies 2: The Swiping Machine
- Dora & Diego to the Rescue
- Save Diego
- Dora's First Trip
- Baby Jaguar's Roar
- Dora's World Adventure
- Dora Saves the Mermaids
- Dora Saves Three Kings Day
- Dora's Big Birthday Adventure
- The Big Red Chicken's Magic Show
- Halloween Parade
- The Secret of Atlantis
- Dora's Rescue in Mermaid Kingdom
- School Science Fair
- Dora & Perrito to the Rescue
- The Butterfly Ball
- Dora's Fantastic Gymnastics Adventure
- Dora & Diego's Amazing Animal Circus Adventure
- Dora's Thanksgiving Day Parade
- Dora & Diego Save Atlantis
- Dora & Diego in the Time of Dinosaurs
- Dora's Museum Sleepover Adventure
- Dora's Animalito Adventure
- Dora's Night Light Adventure
- Diego appeared on 4 double-length episodes of Dora the Explorer. They were "Dora's Pirate Adventure", "Dora's World Adventure", "Dora Saves the Mermaids" and "Dora's Big Birthday Adventure".
- Diego, his sister Alicia, Baby Jaguar, and the Bobo Brothers appear in the Dora and Friends episode For the Birds.
- Diego was voiced by a total of seven voice actors.
- Diego never appears in Season 1 or Season 2 of Dora the Explorer.
- Diego was played by Malachi Barton (6), and Jeffery "Jeff" Wahlberg (16) in Dora and the Lost City of Gold.
Main Márquez family
|Dora | Diego | Alicia | Mami | Papi | Abuela | Guillermo | Isabella|
|Swiper | Grumpy Old Troll | Bobo Brothers | Alejandro|
|Backpack | Map | Rescue Pack | Click|
|Boots | Tico | Benny | Isa | Big Red Chicken | Señor Tucán | Fiesta Trio | Baby Jaguar|
|Pablo | Alana | Emma | Kate | Naiya | Sammy | Randy|