|Debut||Russell Up Some Fun|
|Voiced by||Peter New|
Mary Frances is a pig who first appeared in Russell Up Some Fun. Despite the feminine name (which he did not exactly approve of), he is a male pig.
Mary Frances is a pink pig with pink eyes.
He wears a fuchsia bow.
Mary Frances was dropped off at Littlest Pet Shop's daycare by Mrs. Twombly. He insisted to the other pets that he is a boy, despite his name. He was later thought to have gone missing, but was in fact under a table, eating a bowl of potato chips (only to fall asleep soon afterwards).
- Blythe's Big Adventure Part Two (cameo)
- Bad Hair Day (cameo)
- Russell Up Some Fun
- Blythe's Big Idea (cameo)
- Super Sunil (does not speak)
- Tongue Tied (cameo
- It's the Pet Fest! - Part 1 (cameo)
- It's the Pet Fest! - Part 2 (cameo)
- OmmmMG (cameo)
- Petnapped! (cameo)
- He is the first of the male pets to have a feminine name. The second was Princess Stori.
- Prior to his introduction, Mary Frances made cameo appearances in Blythe's Big Adventure Part Two (among the owners and pets visiting the shop) and Bad Hair Day (in Minka's fantasy).
- He was one of four pets who had a cameo before their episode debut, the others are Esteban Banderas, Madame Pom, and Felina Meow.