Fou

Fou is a small, quadrupedal creature with thick white fur, large tufted ears, and an exceptionally bushy tail. He has expressive purple eyes and is almost always seen wearing a light purple scarf. His physical form is diminutive, making him appear as a harmless pet or mascot to those unaware of his true nature.

Intelligent, protective, loyal, snarky, and selfless.

Mascot and Companion of Chaldea

Originally known as Cath Palug, the Fourth Beast of Calamity, he was the companion of Merlin in Avalon before being cast out into the human world. He eventually arrived at the Chaldea Security Organization and formed a deep bond with Mash Kyrielight and the Protagonist. At the end of the first Grand Order, he sacrificed his accumulated power and sentience to resurrect Mash, losing his status as a Beast to save his friends.