Mont-d'Or is the 19th son of the Charlotte Family and serves as Totto Land's Minister of Cheese, governing over Cheese Island. He is also a member of the Big Mom Pirates.

Mont-d'Or is a lanky man with long limbs and a stocky abdomen. He has a rounded chin that sticks out, a long pointed nose, and a predominant slouch. He wears an open-chested, dark-colored jumpsuit with a skeleton pattern following the limbs and ribs. He also wears a dark-colored top hat with a light pink colored ribbon, as well as dark lipstick and eye makeup in the shape of a single line going down each eyelid. His appearance is reminiscent of a child's skeleton Halloween costume.

Mont-d'Or is very fearful of Charlotte Linlin. Mont-d'Or is also somewhat rude. He is very suspicious, and even doesn't trust his older brother. He also seems quite authoritative, as he held and led a meeting with his brothers and sisters, and some Big Mom pirates and also gave orders to his underlings, disregarding what Opera said.