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. His catchphrase is "Peek-a-boo!" In the mystery adventures, he wears a black moustache. He is voiced by Stephanie Darcy.