Kate is one of the main characters in Dora and Friends.
She is voiced by Isabela Moner, who also played Dora Márquez herself in Dora and the Lost City of Gold.
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"Kate loves to sing, dance, act, and grab the spotlight whenever she can! Artistic Kate is known in school for her colorful personality. She loves to read stories and trade books with Dora, but she loves to make her own stories as well, writing plays for the neighborhood kids and dressing up in costumes whenever she feels like it!" — NickJr.com