Rover

Rover is a cat character from Animal Crossing who sets up the player at the beginning of the games (excluding New Horizons). Canonically, Rover lets Vine to introduce himself on the train to his set village. He may or may not be the G-Man of the Animal Crossing series.

In Vinny's third GameCube corruptions stream where he corrupted the original Animal Crossing, Rover appears several times from headbanging in his seat to a 16-faced abomination that would make Two Faced look normal.