Mandy

Mandy is the cynical second main character of "Grim Adventures of Billy and Mandy".

Role in the Christmas Special
Mandy is the second protagonist of the "Grim Adventures of Billy and Mandy" special, "Billy and Mandy Save Christmas". She does not believe in Santa Claus until she, along with Billy and Grim, travel to the North Pole, where they learn that Santa was bitten by a vampire.