The Blue guard form the Tsuna island

Tsuna's island guard. It is an island located in the eastern seas, inhabited by a race of demihumans with aquatic capacities similar to those of a fish. They are excellent swimmers and having both lungs and gills, they are capable of living both, on land and in the sea. The blue gurad is the army designated to guard the matriarch of the island and defend its inhabitants. Their main weapon is the trident and they are excellent swimmers. The army is made up of women, while men are mainly engaged in fishing and taking care of the child.