Hybrids are the outcome of a marriage between two different species.
Hybrids come in various shapes, sizes, and colors. Usually, they take more from one parent than the other, but perfect in-betweens (in appearance) can occur. The look of the hybrid offspring is completely random, meaning that two hybrids of the same species can look drastically different. It is important to note that even if they share traits of a said species, it is not automatically functional (for example: some unicorn hybrids have a horn, but no venom).
They are rare, considering most species don't often mix, and having a healthy hybrid offspring is quite unlikely. Hybrids, with their unusual look and abilities, have a completely hazardous fate. It is impossible to know if they will stay healthy, and what is their lifespan. It is also impossible to predict their definitive appearance over time, as it is subject to change with the years.
It is important to note that some hybrids are fertile and some are not, all thanks to the hazards. Only species that are close enough can produce hybrids (for example, a noctule and a kelpie can't have any offspring). A hybrid can have offspring with the species they resemble the most, and can eventually give birth to a normal-looking individual, even if they might have some minor tweaks (not enough to be considered a hybrid). Two hybrids can't have offspring together, mixing genes too much will not have good consequences...
Not only their appearance have both parents' traits; but their behavior, and instincts, will also be determined by their parents' species, which can be quite conflicting for the hybrid creature, and has been depicted as a form of suffering in the case of Kiersten.
Hybrids are seen either as freaks or wonders of nature, depending on the vision. Some are celebrated for their incredible existence, and others are totally hated because of their nature. It obviously has a lot to do with the two species they are coming from.
Known hybrid characters -