Metriowani is a crocodile, presumably one of the three largest of them. He has not been seen, but was mentioned by Rutiwani. Rutiwani said that he was taking a risk on Odayaka by allowing him to begin learning to summon crocodiles, because if his choice was proven unwise, the other two giant crocodiles would have his head. On second thought, he mentioned that perhaps Metriowani would not, but the boss definitely would. As Rutiwani is the lord of the terrestrial crocodiles, and Regiwani is the lord of amphibious crocodiles, as well as the king of them all, it is speculated that Metriowani is the lord of the aquatic crocodiles.