(Incomplete. Note: This is a non-despair au with Ultimates.)

Demons:
Physical traits: Horns, tattered, dragon, or bat wings, demon tail, forked tongue, sharp teeth, streaked hair and multicolored eyes.
Psychological traits: They're usually rather sadistic, mean, cold, and violent tempered, with some insane habits. However this varies for all of them based off the circumstances in which they were raised in. Since they've always been discriminated against, some of them are actually quite timid.
Skills: Flying, dark magic, fighting, inflicting negative emotions, teleportation, elemental magic, shadow control, mind control, being able to tell when someone lies, seeing ghosts, the power to make things wither, and an immunity to fire. Of course their abilities depend on the genetics of the demon, and their strength, but they all heal fast, have incredible speed and agility, have good night vision and can hold their breath for minutes on end.
Home: They live in the shadow dimension of the world, with freezing places covered in ice and stone, and areas covered in fire and gems. Most of the entrances into their world are below ground, or in caves. This world is called Xaforen.

Angels:
Physical traits: They have feathered wings, and sometimes halos. They can also have animal ears, and sometimes tails. (Note: This does not make them furries, it makes them animal hybrids, essentially.)
Psychological traits: Their qualities are usually shy, kind, and optimistic. They're the more loyal ones, however they can vary from being peaceful to being warlike, and it really depends of the circumstances. 
Skills: Flying, inflicting positive emotions, healing people, teleporting, light control, the ability to control the weather, elemental magic, and the power to make things grow. Their abilities vary based off their power and genetics.
Home: They live both among humans, and in a parallel sky dimension that can be accessed by flying at a certain height and speed in some weather conditions, to open a portal. Their dimension is known as Ceaira.

Fallen Ones:
Physical traits: They can have angel wings in a darker color, an aura, animal ears, scales, horns, or demon tails.
Psychological traits: Their qualities are usually depressed, emotionless, calm, and quiet. They used to be a demon or an angel, until they committed an act that changed them. However some of them are extremely unstable and dangerous, being warlike. Definitely a fearsome opponent, they can hold grudges for centuries. However they lack motivation to do much, unless fueled by rage.
Skills: One of the most powerful species, they retain a darker version of their powers, with new and evil abilities. They can use blood magic, and control people and objects, among other things. They're linked to the cycle of the moon, their powers get stronger and weaker with it. They also have the ability to control stone and gems. They can also shapeshift.
Home: The main species lives in a shadow realm called Zaragath, however for the past few centuries all communication was cut off to the home planet, meaning that most of the species is now missing, and it's unsure of exactly what their fate is.

Hybrids: 
Physical traits: Hybrids: A mix of different angels, fallen ones, demons, and/or human. They can have one or two physical traits from their parents, however the main trait comes from the species their mother was.
Psychological traits: They have no hereditary personality traits, like a human with a blank slate, it all depends on how they were taught and raised. Likely though, they have very strong feelings, and can be bipolar. 
Skills: Their powers are a mix of their parent's abilities, however bloodline power traits can pass down through generations without being activated. Powers can also skip generations.
Home: They live in wild places in the earth, or mixed in among humans, the mountains being the most common places for the more unhuman ones.

Humans: 
Physical traits: They lack the other features of the other species, usually appearing bland to the Mythicals.
Psychological traits: They're usually rather narcissistic, and are usually self-centered to some degree, or they find it hard to focus on the full unbiased picture. Of course, not all of them are bad, people just believe in the easiest option. Not everyone does, but the majority of the species ends up like that.
Skills: Creativity and inventing, along with determination.
Home: They live on earth, in cities and towns.

Reptilians:
Physical traits: An intelligent species that hides among humans by using magic, they have serpentine and lizard like traits in their true forms, and occasionally minor demon traits. The younger ones usually have patchy scales on their chest/torsos, scales on their hands, or scale patches on their faces. They also have forked or long and pointed tongues.
Psychological traits: They're a rather cold species, with high intelligence and a very good knowledge of science, and they can be traitorous or loyal. If they're going to do something, they do it drastically. They make great leaders, and one of their best traits is how environment-focused they are, caring about nature and believing that if any species was to go extinct, it would offset something in the world. 
Skills: Photographic memory, telapathy, the ability to talk to plants and animals, teleportation, extremely high technology, some elemental magic, enchantments, illusions, and the ability to build and move things with their minds, along with being able to transmit things telepathically. 
Home: The majority of the species lives in outer space, in a giant self-sustaining spaceship. This is why they're called aliens. Their spaceship is called Kashar.

Tricksters:
Physical Traits: Usually fond of checkerprint patterns, and other things associated with luck or manipulation, such as dice and chess, their outfits have these aspects. They also will usually have one demon wing and one light colored angel wing, or demon horns and white angel wings, or sometimes even rams horns and dark angel wings.
Psychological Traits: They're usually atrocious liars, and mask their true emotions. They're quite mischievous, and cause trouble whenever they can, as they grow easily bored. They have a fear of getting close to people, or developing 'human' emotions. They also usually are quite scared and sensitive, beneath their emotional masks.
Skills: Intelligent, they're very manipulative and can shapeshift, as well as having some control over fire and wind. They're strongest on halloween, and can levitate. When they use their elemental powers, it usually makes their eyes glow. They also have some telekinesis, and foresight. 
Home: Earth, either in the larger cities, or small villages, however they were persecuted as witches in the middle ages.

Nightwalkers:
Physical Traits: Longer fangs, red/grey/black eyes, usually hypnotic flecks of color in their irises, narrower pupils. They also have paler skin usually, and pointed tongues. 
Psychological Traits: Usually quiet and reserved, some can be rather obsessive. They're usually Yanderes/Kuderes, appearing normal though outcasted or unpopular/unnoticed, but truly, they're dangerous, creepy beings. Most Mythicals stay away from them and their bloodthirsty cravings.
Skills: They can travel through shadows, freeze people in fear with their eyes, are almost impossible to kill, can see in the dark, shapeshift to some degree, and defy gravity. They do drink blood, but this is because they are practicers of the Forbidden Magic. So they drink blood to replenish their own, which they lose in the activity of performing the rituals. 
Home: They live in both the human world, and the uninhabited of Xaforen, the Demon World.

Lore:
They were originally all one species, the Mythicals, excluding the humans who existed as a separate species to the Mythicals. However, as the Mythicals split up and moved away, adapting, they split into different subspecies, the reptilians, the demons, and the angels. Eventually everyone was in one group, and they became species of their own, with subspecies focused on different elements. Hybrids were the result of Mythicals from their different species having children with someone from the other species. Fallen ones were created when the child of an angel and a demon discovered a thread of a new mineral, called . This crystal transformed them into a darker being of energy, becoming a Fallen One. While the area was put under quarantine and destroyed, Mythicals with darker intentions sought out the crystals to gain the powers that came with them, and soon enough they were a new race, the crystal passing itself down through their blood.
All Mythicals have telepathy/telekinesis, as well as foresight. They also usually look better then normal humans, due to being more 'perfect' beings.  
Soon enough humans and the Mythicals had a war after Reptilians refusing to trade their own advanced tools, demons retaliating with attacks, and other events. This lasted for several decades and was lost because the Reptilains played defensive, and the angels refused to fight. People thought they had wiped out the reptilians and demons, and then the angels rejoined them. 
Most of the hybrids fought in this war as well, with a few of the fallen ones, however the fallen ones were more focused on their own race, along with the fact they lived in a parallel shadow dimension and couldn't get many people onto earth to help. At the same time, a plague was spreading through their species, so they were forced to focus more on their own survival.
However, later on humans betrayed them and wiped out some of their species, causing them to flee.
That's why there's a long standing grudge between the warlike demons and the traitorous angels, mostly because of the angels betraying them and because the angels had the most survivors. However, the winning side writes history, which is why demons and reptilians get a bad reputation nowadays, and a rumored to be darker beings.

After the war, a new species known as Nightwalker appeared. They were the children of Fallen Demons living among people, and Humans. The rumors of vampires were based off them, with one crucial difference. Nightwalkers cannot be killed by sunlight.
They do, however, sunburn very easily, and hunt at night. 

Tricksters were also known as Jokers, Jesters, and Shapeshifters. They showed up after the war, living among humans. It's likely they were the result of Nightwalkers and Fallen Hybrids with Reptilian blood mingling. They're known to be mischievous devils, always lying and causing trouble among humans.

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Starters: