Mermaids are a marine race appearing in the original Final Fantasy. They have humanoid upper bodies, but have fish-like lower bodies. They inhabit the Sunken Shrine near Onrac and the Lifespring Grotto. A group of Mermaids were taken hostage by the Kraken, when he attacked and drained the Water Crystal. When the Warriors of Light arrive, the Mermaids ask them to destroy Kraken for them, stating that if the Water Crystal was not restored, they would turn to sea foam and die. The heroes succeed, and the Mermaids' existence is no longer threatened.
Mermaids lived alongside humans in Lifespring Grotto, but inside the dungeon only mermaids are seen, often salvaging tinkers from water.