She is first seen at the Spiders Cafe with the rest of the officer agents, and then at Crocodile's meetings at Rainbase. She demonstrated a calm and no-nonsense attitude to her work.
In the final fight between the Baroque Works and the Straw-Hat Crew, Miss Merry Christmas and Mr. 4 fight against Usopp and Tony Tony Chopper.
She was defeated by Chopper's Horn Point transformation. After blinding Mr. 4 with his Kemuri Boshi (Smoke Star) Usopp was able to escape from Ms. Merry Christmas and her partner's combined attack (Molehill Intersection Number 4) leaving Chopper to scoop her into his antlers. Falling for Usopp's impression of her, Mr. 4 immediately slugged her in the face with his bat and sent her flying into a stone arch.
Shortly after the trio was defeated, Lasso coughed up one last explosive baseball. Mr. 4 and Miss Merry Christmas were later taken to prison, where Miss Goldenweek visited them. They managed to escape and are now working in the new Spiders Cafe.
Abilities and Powers
Miss Merry Christmas has the power of the Mogu Mogu no Mi (モグモグの実, Mole Mole Fruit, called the "Diggy Diggy Fruit" in the English anime), a Zoan type fruit that gives her the ability to transform into a giant mole or a mole-human hybrid, Usopp thinks is a penguin. Because of this transformation, she can easily dig underground in the sands of Alabasta and sneak up on opponents, and attack with her sharp digging claws.