Dora the Explorer Wiki
Dora the Explorer Wiki

Guillermo Márquez is Dora's baby brother. He is a 1 year old baby who has a twin sister named Isabella. He wears a blue shirt and a white diaper. In Happy Birthday Super Babies he wears a different shirt and blue pants. He appeared in many episodes of Dora the Explorer starting with "Big Sister Dora". Like Isabella, he remained unnamed until the episode "Dora's Jack-in-the-Box", where his name was revealed. Like Isabella, he appears in the Dora and Friends episode "Magic Land", in which he appears a little older and can speak in full sentences. They also helped Dora in Super Babies.



  • In Dora and Friends: Into the City!, a slightly older Guillermo lives with his sisters, parents and Abuéla in the city of Playa Verde.
  • He is possibly the older twin.


Major characters
Main Márquez family
Dora | Diego | Alicia | Mami | Papi | Abuela | Guillermo | Isabella
Swiper | Grumpy Old Troll | Bobo Brothers | Alejandro
Object helpers
Backpack | Map | Rescue Pack | Click
Forest friends
Boots | Tico | Benny | Isa | Big Red Chicken | Señor Tucán | Fiesta Trio | Baby Jaguar
City friends
Pablo | Alana | Emma | Kate | Naiya | Sammy | Randy