The bully snail is a sea snail who has a grayish-black shell with silver spikes on it. He has a pale purple body with a darker pink underside and also has dark olive-yellow eyes. His shell has a thin white swirl and a bandage on it.
When Gary sees Mable-Monica and her pet snail, Mary, on the boatmobile and decides to slither after it on the street, the bully snail grabs him by the tail. Gary is surrounded by him and Dan the Orange Snail. His spikes get stuck in the fence when he tries to get out through a gate hole.