[@Teyao] Welcome, glad to have you!

[quote=@Iten]
FUEL FOR MY WORLDBUILDING SICKNESS
[/quote]

All good questions! Lemme see here...
[hider=MONSTERS AND DEMONS IN GENERAL]As far as Monsters and Demons go:[list][*]"Monster" refers to any organism that, in addition to just being plain meaner, stronger, and often bigger than others of its clade, does not have an inherent fear of Humanity, fire, or other things that the animal kingdom has generally learned to avoid. They see humans as prey and will actively hunt them regardless of territorial behavior. While possibly clever and vicious, they are non-sapient. An Ogre, for instance, is like a particularly volatile gorilla in terms of intelligence (no offense to Koko and Harambe) and a Goblin is like those chimpanzees that are starting to learn how to use spears and rocks. Wyverns, giant centipedes, the parasitic plants that can substitute themselves as musculature to move a human skeleton, etc all count.
[*] "Demon" is a more arbitrary term, and refers to anything that is NOT a Human, Elf, or Dwarf that also shows hostility towards the "enlightened races," along with some level of civilization. They could be primitives like Orcs, or near-humanly sophisticated like Devils. They are sapient and capable of self reflection, but have cultural and biologically driven differences that make them by and large incompatible with humans. By occupying many of the same niches as the enlightened races do---being omnivorous, using wood, stone, and metal to build, etc---there simply does not seem to be enough room on the continent for the both of 'em. Frieren's demons would be a pretty good comparison to some of them, but not all---Frieren's come across to me as wonderful examples of socio/psychopathy, narcissism, and "masking" behavior, but some demons in this setting would be the opposite of those extremes; all impulsivity and escalating emotions with no ability to de-regulate would pretty well describe an orc, for instance.[/list]

[hider=HALF DEVILS IN PARTICULAR]A Half-Devil would be equally likely to inherit eye, hair, and skin colors from either the human victim/parent or the devil, sometimes even both in combination. Devil eyes range through red, yellow, orange, indigo, and purple; they are like bird-of-prey eyes in their shape. Hair ranges through the kind of unnatural, pastel or vivid colors humans have to use dye to get. Skin ranges from gray through shades of blue/purple with heavy de-saturation. They will always, however, have horns, but never have the devil's near-vestigial wings nor their tail. Horns (at least two of them) grow much like nails, typically near the temples or straight out of the forehead, but the smallest they ever get would be the width/length of a finger. Cutting them off, filing them down, or even surgically removing them IS possible---but causes the kind of pain that could drive a human being into shock, and even after healing leaves behind scars that are so sensitive the poor creature will get brainfreeze every time they step outside on a winter's day, or headaches when the rain brings barometric changes. If you're a magic user, you would also experience an extreme dip in your sensitivity to environmental Mana---but, you'd actually be no different from a full-Human in that regard.

Half-Devils also tend to suffer more from undesirable psychological issues, trending towards what we know as Cluster B Personality Disorders. This is a world where psychiatric medicine is far from our own, so it is unclear if they develop these issues because of how they're treated by society, or by their demonic nature.

A Half-Devil that manages to survive long enough to somehow have children can produce Quarter-Devils, in which case they only seem to inherit the chance for devil's eye/hair colors and a single horn; if this horn is removed while they are young, they have a much better chance of the previously mentioned sensitivity issues clearing up as they age---but it is still very traumatically painful for the child, and may be a cause of the same psychological issues their parent had. Past Quarter-Devils, the demonic blood seems too diluted to influence phenotype past the occasional instance of heterochromia, but other non-visible traits are still present.

Some say, however, a Quarter-[i]Human[/i] is somehow [i]worse[/i] than a full-Devil...[/hider][/hider]

[hider=LUZIA AND DEMONS]Luzia has been, in many ways, inattentive of certain happenings on the continent. Until the war begins in 1012 YC, they consider "demon armies" to be species-specific. They sometimes target them for suppression, either by the border nobles or by requests to Adventurer Guilds, but the idea of a "unified demon society" seems impossible based on everything they've known about the creatures thus far. The biology/ecology of many demons and monsters is well known, but the biggest mystery surrounding them is how their unique abilities and magics seem to work, their relations to miasma and each other, and what among Humanity's religious mythos/history regarding them is actually true. Demon religion is also unknown, but many speculate they believe in a pantheon of some sort or worship their own ancestors based on what little anthropological evidence has been discovered in their camps, settlements, etc. All that is known about their interactions with Miasma is that it invariably attracts them, and some types---especially Devils---seem to be able to perform an unknown type of Magic, colloquially referred to as Curses, that allows them to direct the Miasma from its origin point. In rural areas, some people believe that "bad winds" are caused by a cartoonishly-stylized devil holding a comically large fan and "blowing" the miasma their way.

Monsters found in the kingdom are sometimes left alone, being that they are still considered "part of nature" to an extent, but the more violent/invasive ones like goblins are usually kill-on-sight. Demons, however, aren't tolerated to any extent unless they hold some essential advantage that forces humans to risk negotiations. 

The physical comparison between Demons and humans largely depends on the particular type. Orcs and Wulvers would be stronger than most Men, Lizardmen and Merfolk are about the same unless you're in the water with them, Devils are typically physically weaker. The number of Demons and Monsters the Kingdom is aware of is quite large. Rattling off some, but not all, without repeating the kinds I've already mentioned would include: Drakes, Wyrms, Trolls, Hobgoblins, High Orcs, Cockatrice, Satyr, Wargs, Boogbears, Harpies, Sirens, Dryads, and Lamia/Naga.

As for Demons of note besides the Demon King, there are many wanted posters in the Adventuring Guilds for particularly known individuals---the names given to them, however, are not always their real personal names, but just convenient monikers for identification. During the war, however, those names that most humans came to know and fear were the Four Demon Generals---Melusine, Yaku, Myrddin, and Bagradas. The Merqueen, Beast King, Frozen Heart, and Living Fortress.

[hider=THE ROYAL FAMILY]On the Royalty of Luzia: The king is Auryos Lohin Arkivum-Kyn Luzian ex Ylliastrum. He is 46 years old and has been on the throne for 6 years following the abdication of his father; the previous king died 2 years ago. He has 2 wives, neither of which have been given the title of Queen Consort yet, and four children. His first wife gave birth to the First Prince and Second Princess, and the second wife gave birth to the First Princess and Second Prince. The First Princess is the eldest of all the children at 18, but has a reputation for being somewhat unruly. The laypeople like the First Prince well enough, and at 16 he seems the obvious choice to most for the position of heir. 

The other Vassal Families, at this juncture, aren't really all that worth writing up big lore dumps on yet. They're your typical blue-bloods, those who own land and titles, constantly squabbling and trying to climb over each other. A few of them are Branch Families of the Great Three, but we'll meet them when they become relevant.[/hider][/hider]

[b]For now I must sleep, but the CS is mostly finished and will be up tomorrow![/b]