Lanny's one-hundred year-old pet fish and only friend. He is malevolent and perpetually grumpy. It would seem that Yamakoshi is the true schemer against Brady but being confined to a fish-bowl makes it impossible to carry out his plans without Lanny. Surprisingly, no one but Lanny can understand Yamakoshi when he talks, despite the fact that he has yelled at the king on two life threatening situations. He has little if no respect for Lanny.