Hul Nostra, city of metamorphs (see Ix campaign map).
This city's proximity to the mutoid wastes has caused a variety of unusual human-variants to arise. These make up approximately 30% of the population.
Pandrogynes: Sex changes on a periodic cycle, usually over the course of a year. Male -> hermaphrodite -> female -> sexless -> cycle restarts. If a pandrogyne becomes pregnant during its hermaphrodite or female phases, the sexual cycle pauses until the child is born.
Bimorphs: Have two distinct forms, usually both the same sex. Change between forms is voluntary but takes 1d4 days. Drugs exist which can accelerate this transformation.
Monoforms: Beings whose bodies adapts to match that of those around them, over a period of several weeks. Monoforms living in mixed company attain a kind of in-between or average state of those around them. Settlements consisting purely of monoforms are made up of identical individuals, and are sometimes mistaken for clones. When in the company of a single individual, a monoform can eventually achieve an exact mimicry.
Phagomorphs: Those who take on the appearance and characteristics of the beings they consume, by genetic absorption. Phagomorphs typically die young, as they develop non-human physiology which is unable to support their bodies. However rumours tell of specially trained (and carefully nourished) sects of phagomorphs engineered to exhibit powerful animalistic traits.
Changelings: An extremely rare form of metamorph -- one which can change its form at will. True changelings are valued for their talent as spies and assassins. Changelings are unable to reproduce, and thus cannot be deliberately bred.