Mo is one of the main characters from the book series Poppy Cat and its animated adaption. a feisty, tiny and anthropomorphic young orphaned five-year-old pink plush toy mouse boy with a yellow head, pink cheeks, black freckles, pink ears and a striped tail who is Alma's best friend. He loves eating cheese sandwiches, singing and writing songs with Alma and is the youngest of the group. His laugh sounds like a cackle. He wears a red and green-striped tanktop and is best friends with Alma who doesn't get squished by Zuzu. He loves to get tickled by everyone else, but he looks like Zuzu's little brother figure. His catchphrase is "Peek-a-boo!" In the mystery adventures, he wears a black moustache. He is voiced by Stephanie Darcy.