Judd the Cat is a cat in the game Splatoon. He is the referee in the Multiplayer modes.
After the match is over, Judd will judge which team wins by judging how close they got to completing the objective. In Turf War for instance, it's whoever covers the most ground. In Splat Zones, it's whoever let the main timer get closer to 0. The arrow on his tail points to the winning side.
After he's done judging, Judd can be found taking a catnap on a trash can in Inkopolis Plaza.