|Show||Dora the Explorer|
|First Appearance||"Rescue of the Red-Eyed Tree Frogs" September 6, 2005|
Diego Marquez is an 8-year-old Latino action-adventure hero with a big heart. His goal is to save and protect the animals and their environment. Athletic and fearless, he is always at the ready no matter what the situation. Diego loves learning new things. He takes a scientific approach to problem solving and also uses a variety of high-tech gadgets and gizmos to save the day. Diego learns a lot from his parents who are proud that their son cares for nature. In Diego Saves Baby River Dolphin! and Tuga Helps the Moon, it is shown that Diego is very ticklish. As shown in Diego Saves Baby River Dolphin!, Diego finds river dolphin beaks very tickly, as Baby River Dolphin rubbed his beak on Diego's chin and Diego thinks it tickles. Diego is the youngest child in the Marquez family and the only son to his parents.
Ultimate Nickelodeon Brawl Stars XEdit
Diego appears as a non-playable character in Ultimate Nickelodeon Brawl Stars X. He appears as one of the characters who got apprehended by Pariah Dark. It was revealed that Dora was going to look for him after his sudden disappearance.