Yes they are an open species, be sure to read all of this and please note me with the info for your character before you design it to get approved by me, and you must also be a member of 
Name: Isos
Status: Civil (humans have accepted them as citizens of the planet, or at least most human civilizations)
Origin: Unknown
First Appeared: 2020 FUTURE
No one knows what the Isos actually are or where they came from, for the Isos have kept is a secret from humans. Some believe they are aliens from a distant world, others think they are a result from a freak mutation in birds or reptiles, while others believe it's a failed experiment to create a dinosaur from fossilized DNA. There many other theories but non of them have been proven.
Meeting the Humans
The Isos first appeared in the year 2020 when the Earth was almost nothing but a complete wasteland destroyed from pollution and nuclear war, and the humans were struggling, their waters were too toxic to drink, the animals all had horrible diseases, it was then when the Isos appeared before the humans. The Isos of Each element began healing the earth it was the first 9 ever seen, which are also known currently as the oldest living Isos, the water cleaned the planets oceans, rivers, and seas, the earth created mountains that were once leveled by bombs and leveled the cities to create new ones, the fire burned all the waste and killed diseases, the plant brought back the worlds forests, the ice brought the ice back to the poles, the light cured the illnesses, the dark eliminated all the harmful substances from existence and destroyed factories and weapons, the wind cleared all the dust clouds covering the planet, and the color cleared the atmosphere and brought back the colors of the stars.
Humans being so thankful to the Isos accepted them as friends and the Isos race began to live alongside humans and began to created the 10 Isos cities, and had also helped the humans rebuild theirs. Learning from the Isos the humans now do what they can to keep the Earth clean and safe from destruction.
It is now 2521 and the Isos still live alongside the humans their cities are large and powerful one city for every element in a location that brings their elemental power to its fullest, such as the Ice city being located in an arctic region, or the fire city located in a volcano. One city for each of the 9 elements, plus another the Isos Capitol home of the elders.
Elemental Powers
Every Isos has at least one elemental power (and currently you may only make single elementals)
There are 9 different elements
Fire- Can control Fire at their will (can expand to molten magma)
Water- Has complete control over water (can expand to most fluids, can also control mist/fog)
Ice- Control over ice (can freeze water, and cause areas to drop to sub-zero temperatures)
Light- Can bring light to anything known to be very kind and pure
Dark- Can cause things to go pitch black and can remove non living things for existance, known to be solitary preferring to be around only other dark elementals (though some are quite the opposite)
Wind- Complete control of the sky can create strong gusts of wind, and can even create wind "blades" and slice through objects
Earth- Complete control over any earthy material, though most can only control rocks, dirt, and sand. Only the most experienced can control gems, metal, and molten magma (fires and earths share the ability to control molten magma)
Plants- Can control plant life, and can also create new plant life
Colors- Can control colors, not much of fighters for they can't use colors to attack, if they were to fight they're rely mostly on their physical abilities, though they can use their color power to alter the colors of it's surroundings to make it a perfect hiding place for themselves and to distract their enemy
Appearance
Size
Hight:
Males 7'3'' - 8'
Females 6'5'' - 7'1''
Average Length: (length varies but most fall under the fallowing length some can be much longer or much shorter)
Males 15'7'' - 25'5''
Females 14'2'' - 22'8''
Weight: The weight varies completely on the individual and on element, for example earths tend to be heavier than winds
Wing Span:
wing span will usually be about the same as it's length more commonly longer
Head
They have faces that looks like someone mixed a dinosaur with a canine, they have a large sinus cavity and large nostrils giving them excellent smelling abilities, their eyes are pointed forward and can adjust to any amount of light they have eyes better than that of an eagle, they have large pivoting ears which can easily capture sounds in the surrounding area. They also have large crests on their heads which are usually folded back, though they can pop up involuntarily with strong emotions such as rage, pure joy, fear. Some like to showoff their plumage, the prettier your feathers the more popular you are with the opposite sex. Isos also tend to lift their crests when mocking others.
Body
Not much to say other than their body is long and slender, as well as muscular, though their are some who can but a lil chubby lol
Legs
Front Legs
the front legs are shorter than their hind legs so their hips are higher than their shoulders when standing. Their front feet can be used as hands and have opposable thumbs, Hands have 4 fingers and one thumb
Hind Legs
the hind legs are longer than the front, they are very muscular and powerful. they have 3 toes and one large sickle claw, used for tearing apart prey.
Tail
The tail actually holds the butt feathers and the tail feathers.
Butt feathers
these feathers start at the base of the tail and extend down to at most 1/4 of the tail, they also contain 2 "display feathers" the wider they are at the end the more attractive it is though these feathers don't get as much attention as the crest
Tail feathers
now these are a large part of the Isos' diplay, the longer and wider the fan is of these feathers the more attractive you are, the pattern on the tail varies.
Wings
An Isos is capable of retracting is wings into it's body
the size of it's wings can vary
Wings is another major part of the isos display, and if you have a long wing span and wide wings you'll never want to hide them, Isos with large wings are loved by others, especially with the opposite sex.
Most Popular in Elements
What I mean by this is by attractiveness to the other sex
Winds- Winds tend to have larger wings, which get them some attention
Colors- The color have to most vibrant colors and marking even if they have somewhat small wings of displays their colors and patterns make up for it
Waters- The water tend to have larger Tail feathers, for it aids them in swimming
Lights and Darks- Both tend to have large crests
Ices- they tend to have thicker plumage just making them fluffy lol and more attractive
Earths- Surprisingly enough they tend to have larger wider wings, their wings are usually either short or very long and wide, they also have thick plumage on their tails, used for their earth manipulating
Fires- They tend to have larger crests and wider display feathers like a phoenix
Plants- They tend to have larger crests and tail feathers
Now even though this is listed hear doesn't mean a wind can't have short wings or a Plant can't have large wings, this just lists which element desirable features are most commonly found in, so you could find a wind with short wings and Giant tail feathers, or a water with Giant wings and tiny tail feathers.
Colors
The Isos base color always relates to its element, and it's usually a dulled shade of a color never super bright or neon, more like a soft green, or a greyish brown
Marking colors, they have a bit more variety on their marking colors though they still usually reflect on their element.
The flesh color, can be seen in their ears mouth and pads
They can have up to 7 colors on their bodies
These color rule exclude the color elementals, they can have ANY range of colors on their bodies
Markings
Their markings, again, usually reflect on their element, such as a water it's markings would tend to look like a flow of a patter, whereas an earth would have more jagged markings.
Lifespan
They can grow to be up to 300 years old, though the elders seem to be immortal as they are thousands of years old
Mating
Isos mate for life and will life together forever once they are bonded. A female will give birth to one pup, though there have been twins. Pregnancy lasts for 13 months.
The child will ALWAYS get its element from one of it's parents or both
Secondary Powers
Will not get into this, for this feature is close and you are NOT allowed to make an Isos with a secondary power
-Chaos
Yet I apparently maxed out my watch list
Oh
*Goes to fix*