Diego Márquez is Dora's cousin.
Unlike the original, Diego seems more stuck up and on the top. He wants to be cool in school. He helps Dora try to not stand out by giving her tips about school. He looks after Dora and keeps her safe.
In the film he is a "Tall and Skinny" male with tan skin just as Dora. He is seen in a unbuttoned blue shirt with an white under shirt. His hair is very short unlike in the original cartoon as his hair was long and spiky.
It is unknown if he is still a animal rescuer as in the original show.