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This is a basic headcanon for my Demonic/Monstrous!AU
Summary: There are three stages of demon forms after the "Suppress" form (Aka the normal and more human looking demon form) which gets more feral and unhinge further to the forms.
- Mid form: Which develop some traits of their Tame form. The Most Human looking with their sclera are black and their arms and legs change into Talon, scales, and insectoid/arachnid like hands and feet.
- Tamed form: This form is more on the line of feral without sinister and animalistic instinct. Just think feral form by standing upright bipedally and be able to talk normally.
- Feral form: No human traits whatsoever. All are on all fours (or more), have an instinct to corrupt or devour humans and other demons. Higher demons tend to see each other as threats and will attack and try to kill one other with or without familial ties.
In general:
At the beginning: Feral > Mid > Suppress form With the Tamed forms is a product of Demons learning to control their demon urges while in their Feral forms, fall angels will develop self-hatred, self deprecating, and other negative thoughts and idea to themselves or beings they consider important to them.
While pure demons have to develop or learn empathy which is a difficult task unto itself.
Suppress forms has become the default for most of the demons, but in rare occasions or in extreme situations Demon can revert back to any of the two forms (Mid or Tamed) with Feral forms as the last resort or if the demon can’t suppress their demon urges anymore.
Which is why in order to avoid transforming back to feral forms, either demons consume a supressvies flower known as blue lotus petals. Or shift to their tamed form once in a while.
If demons stop consuming the petals, and suppress their other form for too long. The transformation back to the other forms is going to be painful, with some changes can last longer depending on if the demon is resisting the change. The last one is necessary to maintain some sense of control, otherwise if the demon fails to do so, they are forced into a slow transformation to their feral form, with no control of their urges.
There are exceptions, demons who are insectoid/arachnid (Asmodeus and Beelzebub) and Amphibian (Barbatos) go through a metamorphosis transformation where they enter a Pupa/Chrysalis stage.
There is a hierarchy like Lesser demons fear higher/stronger demons, with the brothers, the royals, and some noble demons are at the top of the food chain and their real threat is each other. However, lesser demons can climb the ranks, and it changes their forms as a result.
Higher/Stronger demons have certain power, magic, and ability unique depending on subspecies class.
Yes, once reverting or being able to change back to either of the three forms with the negative drawbacks demons will go to Rut/Heat. Which happens once a year, Males will be territorial towards other male demons who aren’t their mates. Even be aggressive towards demons that they consider as Familial.
In all three forms their sense of smell is heightened and they will develop a specific scent of their own that demons, angels and even humans can smell. To humans they can smell something that will associate with death or just reminds them of death. It varies from person to person.
However demons (Like Asmodeus) can mimic other demons' scents. Most of the time it's been used to protect themselves for lower demons who are in a group or pack. The demon will change their scent into that of a demon who is high rank to fool the lower demons.
Other specific demons that are Reptilian or Amphibian (like Leviathan, Diavolo and Barbatos) can regrow lost limbs. However how fast the regeneration depends on which form they are in, with the feral form, the regeneration is quicker.
Avian demons (Like Lucifer and Mammon) have the ability to mimic and create sounds. They usually use this to trick humans into a trap. But either making eerie sounds around the human to push them towards a certain direction or mimic a voice that the human knows.
Feral demons can see human souls, and can tell if the human is weak willed or can easily be corrupted. But this is reserved when a demon is high rank. More specifically the seven avatars and the royal line.
They can also slowly devour the human soul without the human knowing it. They just have to keep close to their prey so they can, they have to have some sort of close contact, like skin to skin contact or through mouth to mouth.
Now when a demon has a mate, they will make sure that other demons know that this is their mate. With marking (Biting, Scratches and Blood mark: Blood marks is when a demon and said mate exchange blood like a blood oath) or scenting. The higher the demon's rank is, the stronger scent they have to put on their mate.
But what if the demon’s mate is a human? The human must be careful with their demon mate. Like they said before, humans are fragile and with the demon bringing in any of the three forms, there will be a chance that the demon will lose control and hurt the human. Even with strong protection magic, there will be a chance of bruises or a broken bone. But the human’s voice can serve as an anchor of sorts, to ground the demon back in control. What works are names that are specific to that demon (aka pet names).
Throughout the decades, demons will perform a certain mating ritual known as The Hunt, where the demon will hunt their mates for fun. Usually they do this in the woods, but in recent years demons who have control over they’re different forms will perform a hunt in high populated areas like a city which is a longer game of cat and mouse. And when the demon catch their mate, the ritual will end with an act of sexual intercourse. If the mate is a human, make sure said human is sure of this last act, because the ritual is complete the demon will be even more possessive than before.
Warning: Some demons will have (Double, and Knots) and expect them to be… big.