Skin

Skintone varies from pinks+yellows+oranges
examples:

Horns

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horns stop growing in adulthood

all genders grow horns
shape is hereditary
grow from the side or back of the head and curve around the skull

most common shapes:

broken horns CANNOT grow back

Eyes

All born are born with 4 eyes
Gemini's don't have eyebrows, but if they close their forehead set it can look like eyebrows

Ears

shape is hereditary

Wings

apparent at birth
vary from small-medium-large

wings aren't fully developed until late teens
wings have become much smaller over time and aren't used for flight

Tails

average length 2ft-3ft (60cm-90cm)
prehensile

shape is hereditary