General Shape and Color are hereditary
most common shapes:
ankle fins tend to match facial fins
Body fins can vary(elbow+dorsal)
Webbed hands can vary also
3-4 color max
Colors/Patterns can be based off any freshwater+saltwater fish
Primary Diet Omnivore/Pescatarian
Enviroment -----
All Pisces are fish, so no sharks, rays or mammals (whales+dolphins)
Siren's can magically transform into merfolk when in deep enough water (not quite H2Orules "EMMMMAAAARRR")
coming soon...