Nymph

A humanoid race that lives under water. They have lungs as well as gills, swiching between the two at will. The can move on land if they have to, but they swim faster than they crawl and need to stay moist. Their culture is tribal in nature, and while they stay hidden from human eyes, they often scavange discarded or sunken items of human making, as well as trade for clothes and tools with those few humans that gained their trust.