Sea orphan is a term used to describe those with the unknown affliction that gives a human certain features of fishes or other sea creatures. According to The Barmaid (herself afflicted) they are distrusted by many of the inhabitants of the Wushanko Isles. As well, there is a group known as the Purists who are attempting to be rid of them, mostly with assault and murder.
Those afflicted are known to be born with gills, tentacles, and even flippers. Sea orphans have a higher resistance to diseases than normal humans. A large group of them can be found on the island of Hyu-Ji.