Fou

Cath Palug, better known as Fou (フォウ), is a character involved with the Grand Order conflicts of Fate/Grand Order.

Background
Fou is an animal that appears to be able to freely walk around the Chaldea Security Organization. It is met by the Protagonist while it is alongside Mashu.

It is Merlin's familiar, released after Merlin was eternally trapped in the Garden of Avalon in the Reverse Side of the World. Merlin uses Cath Palug to temporarily reveal himself in order to help the Protagonist against Cu Chulainn Alter. After stating that they should be able to meet in a slightly different future should the Grand Order project succeed, he disappears.

Appearance
Fou is called a cute animal.