In myth it was the Irish merpeople called Merrows they can be distuiguished from other sea-dwelling faeries in that they wear red feather caps to propel themselves down to their homes in the depths. Should their caps be stolen they can no longer return to their watery homes.
The female merrows are beautiful, and like other mermaids, appear before a storms as an omen, but they are gentle by nature and often fall in love with mortal fishermen. This can partly be explained exetreme ugliness of the male Merrows. Despite their alarming aspect the males too have their redeeming character. Both males and females some times come astore in the form of little hornless cattle.
Personaly I can see Merrows having a liking toward water, though like vampires, they seem harmful when infact they have a great personality.