Guillermo Márquez
Name Guillermo Márquez
Species Human
Gender Male
Occupation {{{occupation}}}
Interests TBA
Dislikes {{{dislikes}}}
First Appearance Big Sister Dora
Last Appearance Trick or Treat
Friends Boots
Relatives Dora (big sister), Isabella (twin sister), Elena (mother), Cole (father), Valerie (grandmother), Diego, Daisy and Alicia (cousins)
Enemies Swiper
Voiced By Hans Alpizar, Vinicius Damasceno (Dora the Explorer)
Miguel Cardona (Dora and Friends)

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. 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.



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
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