Catrina is a baby caterpillar that is just learning how to speak. She is the only child of Madame Butterfly. Catrina is seemingly innocent and charms whomever she meets with her big, black eyes and cute manner. Like other babies, Catrina is highly curious about everything around her, but is always surrounded by her mom or others to keep her curiosity in check. Catrina loves Oswald dearly and he often falls for her charms.
Catrina is almost entirely purple. She has black eyes, three eyelashes on each eye and a black mouth.
Catrina has appeared in many episodes of Oswald. Her first appearance was in "Rollerskating." Her final appearance was in "The Big Balloon Rescue."