Radie

Radie is a slang term for human beings who have been mutated by the Sun's radiation in the future. These mutations are hereditary, so even those not directly affected can inherit them from their parents. Radies are relatively common place in the future, at least in the city of Haddyn.

Gunther is an example of a radie, his mutation taking the form of a fish-like physiology which requires him to live underwater to survive.