Guillermo and Isabella Márquez

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Guillermo and IsabellaDora the Explorer character
Production information
Voiced by	Hans Alpizar (both) Vinicius Damasceno, Miguel Cardona (Guillermo) Olivia Coronel, Breanna Lakatos, Mia Sanchez (Isabella)
First appearance	Big Sister Dora
Last appearance	The Lost Necklace
Background information
Full name	Guillermo and Isabella Márquez
Species	Human
Age	1 (Dora the Explorer) 4 (Dora and Friends)
Alignment	Good
Citizenship	Their house
Relatives	Mami and Papi (parents), Abuela (grandmother), Diego, Alicia, and Daisy (cousins), Dora (sister), Sabrina (aunt), Nico (uncle)
Pets	Perrito
Allies	Boots, Pablo
Enemies	Swiper
Likes	Their banana baby food, their friends and family including Dora, helping their big sister Dora and Boots, being a superhero along with each other
Dislikes	Swiper swipes their banana baby food

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Guillermo and Isabella Márquez are the siblings of Dora from the series Dora the Explorer. They are each 1-year-old babies. They appeared in many episodes of Dora the Explorer starting with "Big Sister Dora". There were remained unnamed until the episode "Dora's Jack-in-the-Box", where his and her names was revealed. They also helped Dora in "Super Babies".

They appeared in the Dora and Friends episode "Magic Land", in which they appear a little older and can speak in full sentences.