Arnold is rather small, even for a bod. He was the smallest baby bod anyone had seen and things haven't changed much as he grew older. He is however always cheerful and can be a bit mischievous as well. Perhaps he is meant to be a permanent youngster. He is always playing with his homemade frisbee knocking things over with it much to the confusion of his human companions in the house. They are convinced that there must be a ghost in the house somewhere.