Gabrielle Walker is the wife of Mr. Walker and the mother of Henry and Grace Walker. She is an artist and illustrates books.

She is described as having large, dark carefully-lined eyes and had cut her curly, medium-length hair very short. She is very observant and has a funny, melodramatic way of talking (for example, everything is "Desperate!" "Mad!" "Hopeless!" "Fabulous!")

In Book #99, it is revealed that Gabrielle is completing a book of African-American folk stories. She and her husband are going to have a joint exhibit at the Fitzroy Gallery.

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