Demon

Demons, Yōkai, Evil Spirits or Monsters are one of the major powers in the world of Taimanin. They come from a parallel universe called the Dark World, sometimes also refered to as the demon realm.

Characteristics
The ability to learn magic, fast regeneration, longevity and strength are typical aspects of demons. "Demon" as a word means creatures from the Dark World but covers multiple species and subspecies with higher intelligence or pure instinct. The cells of demons if implanted into a Human World organism can lead to demonization but also are able to give abilities and heal grave wounds. Miasma a substance of the Dark World can have the same effect and turn one into a demon.

Unlike the current Human World multiple species, with very different body plans make up the lose governments in the Dark World.

Demons are not general knowledge among humans but are strongly rumored, only the criminal underworld or ranking officials are aware but keep it a secret not to create a panic. However, they walk the streets or own shop in human towns, that are known to have a Dark World portal, like Amidahara.

Appearance
Varies strongly but most can at least be identified by pointed ears.

Personality/Politics
They tend to be seen as malevolent, opportunistic, lustful or aggressive but there are cases where they act compassionate and simply passionate overall. How they act, in the end, depends highly on the individual and species. As well as if they like who they interact with. In a sense they are close to humans in all good and bad aspects but with the addition of powers and a large portion thinking they are superior as they value strength.

Differing greatly in look, intelligence, strength, magical abilities or motivation, demons are not a unified force same as Humans. Factions and kingdoms forming around powerful beings like Edwin Black or the Incubus King.

The closest that demons come to a unified government are the 9 Noble Demon Families, that cooperate with the goverments of the Human World. The Hell Knight guarding this system of rule.

At times demons act as informants even for the Taimanin that normally fight them, as they still wish to protect peace between human and demonkind or hope for a better future.

History
Originating from the Demon Realm/Dark World which like the Human World exists, in the Mother Sea, only a small number of demons entered the human world but would at times also mix with Humans.

An implicit rule of non-interference was respected by both Humans and demons, since ancient times and kept both worlds separated. However, humans broke the pact out of curiosity and greed. Striking deals with more and more demons for power and technology. Since then demonic influence spread over most of the world.

After events of Amidahara in which the UFS used a nuke, that possibly a magical experiment in reality, larger and smaller portals appeared. Permanent gateways to the Dark World, most in Japan, some implied overseas. Towns now filled with demon visitors opening shop became part of illegal dealings of technology and weapons. Normal people tend to avoid those places for the high danger, but some try their luck in them, hoping to find something that can only by found in those lawless cities.

The combination of both human and demonic technologies escalates since, into immoral applications, interrupting the balance of power between the powerful nations like the UFS and Chinese Union. Nations stealing or trade, to create weapons in secret, most of the underhanded tactics not revealed to the public.

The 9 Noble Demon Families have remained neutral and deals with the Human governments, have let to the creation of neutral zones and cooperation efforts like Amidahara Prison. To Punish supernatural entities, that threaten the peace and balance. Especially Nomad has attacked secret peace talks in the past because of that most communication between worlds has broken down.

Criminal Demons are the sworn enemies of the Taimanin, that try to push back on their collective corrupting influence in the human realm. Taimanin themselves are able to use abilities rivaling the demons, sharing minor traces of demon blood.

Demons fear, respect and hate Taimanin but also see their use as slaves, breeders or soldiers.

Powers/Abilities

 * Strength: Most demons and half-demons are far stronger than normal humans and can be dangerous, to civilians.
 * Miasma Immune: The Miasma of the Dark World, does not lead to demonization for them.
 * Magic Potential: A large number of demons are able to use magic or have the potential to learn it. What kinda magic they have depends on the species.

Demon Humanoid

 * Amazon
 * Badhbh
 * Dark Elf
 * Doppelgänger
 * Fairy
 * Hell Knight
 * Incubus
 * Inferno Demon
 * Night Butterfly
 * Succubus
 * Dream Painter (subspecies)
 * Vampire
 * Witch
 * Yuki-onna

Demon Human-like

 * Oni
 * Ogre (subspecies)
 * Rakshasa (subspecies)
 * Valkyrie (subspecies)
 * Goblin (subspecies)
 * Golem
 * Orc
 * Troll

Demon Undead

 * Spirit
 * Familiar Spirit
 * Skeleton
 * Grim Reaper
 * Wraith
 * Zombie

Demon Beast-like

 * Arachni
 * Bakan
 * Beastman
 * Bovine
 * Centaurus
 * Dragonfolk
 * Nekomata
 * Merfolk
 * Minotaur
 * Naga
 * Harpy
 * Gargoyle
 * Slime
 * Yatagarasu
 * Werewolf

Demon Animal

 * Black Dog
 * Catoblepas
 * Dark Beast
 * Dark Wasp
 * Devil Worm
 * Dragon
 * Injuu
 * Kanaloa
 * Sleipnir
 * Yuuto

Trivia

 * Though demons presumingly are supposed to be not public knowledge, they walk around some public beaches without any transformation magic.