There's three biological sexes, male, female, and azale. Azale cervai have the ability to change between sexes via magic. Only azale's can access this type of magic, and don't know they're azale usually until the age of 16-18, when magic is taught. They make up 1/3rd of the population, and are highly regarded.
Horns can have any size, color, or patterns on their horns. But they're always in even numbers! 2, 4, 6, etc.
Tails come in all shapes and sizes, anywhere from 6 inches and below, to even as long as 6 feet in some cases! There's a myth that the shape of their tails tells what your career will be. Anyone with a pointed tail with no shape at the end is supposed to be a bartender, anyone with a diamond shape at the end of the tail is supposed to be a lawyer, and heart shapes with the point pointing away from the cervai is supposed to be a succubus/incubus. Hearts with the point pointing at the cervai are supposed to be CEOs/business owners.