Mermen are monsters in Rosario Vampire that are the male counterpart to mermaids.
Bite Size Monster Dictionary[]
A half-fish, half-man ayashi with a pair of webbed and scaly limbs. They are capable of firing a compressed burst of water from their body like a bullet.
Appearance[]
Like mermaids, they are half fish human on the lower half and fish on the upper half.
Powers & Abilities[]
Mermen can shoot blasts of compressed water out of their mouth. As the male counterpart to mermaids, it's possible that they have the same abilities as them.