Well every world must be inhabited with creatures of all sorts. Sure, most of the 100% humans are gone, but there are pleanty of others still here. We'll start with a few of the main ones.
Elves:
The most basic magical creature. Though they are basic, they are anything but weak. Being more in touch with their inner Mana than humans, Elves have gained the ability to cast spells and extend their life expectancy far beyond the human race's. They are naturally nimble creatures and are masters of most weapons, except are unable to weild axes for some odd reason.
Out of the Elves in Rintusa, there are different types that depend on their Element and birthplace. The Elves that live on the Mainland are either ruled by the Elements of Water, Fire, or Earth. The Earth Elves live in the Forest Territory, the Fire Elves in the Scorched Territory, and the Water Elves in the Lake Territory. The Elves that live on Glare Island are ruled by Ice. Those that live in the Cloud Lands above the Mainland tend to be ruled by Light, Air, or Lightning. They are simply called Cloud Elves. The Dark Elves live in intricate tunnels throughout the Mainland and many other places. These shy, not evil, creatures tend to be ruled by Metal, Molten Rock, or Darkness. All of the Elves that exist on the Mainland are under the rule of the Elven Queen, Eliranora. (note: Anora is a title given to Elven Queens. Lilyanora was a past elf queen from long ago. Actually, Eliranora is the reincarnation of Lilyanora)
Dragons:
The once sworn enemy of the Elves. All dragons are physically and magically strong large lizardlike beasts. The Royal Dragon Family, the Wyverns, are the ones who govern the Dragons of the Mainland. Thier current King is Lancelot, and their Queen is Gwenea. Of all Dragons, they are also broken up into groups depending on their element. The element only defines their power and sometimes their scale color, but not their form. A Crevace Dragon, a Dragon of Fire or Molten Rock, may be red or orange in color, but can have the form of a, Eastern Style Dragon, or a European Style Dragon.
There are also creatures that call themselves Half-Dragons, though they are 100% Dragon. These beings have just evolved further than Dragons to take on a humanshape appearance. Some have called them Weredragons in the past, for they can switch between their humanshape form and their full Dragon form at any time. Even in their humanshape form, Half-Dragons still have some features that link them to Dragons, like claws, leathery wings, horns, and long ears.
Half Dragons are split up the same way normal Dragons are. Fire and Molten Rock Dragons are called Crevace Dragons, Water and Ice Dragons are called Sea Serpents, Air and Lightning Dragons are called Amphitheres, Earth and Metal Dragons are called Wyverns, and Darkness or Light Dragons are called Diety Dragons. In the past, there were also the Dragons that could control any Element, the Prisim Dragons, but now the only remnants of their existance are their scales that are scattered throughout the world.
Katreyes:
The strange feline Elves that live on the continent of Saireya. No one knows how they came into existance, but they tend to be even more nimble and quick than the normal Elves. And they aren't called feline just because of their movements. All Katreyes have furry ears, paw-like hands, and a tail, just like a Cat. All Katreyes live under one of the three territories in Saireya, the Forest Terriroty, the Mountain Territory, or the Desert Territory. Forest Katreyes tend to be faster than the rest, but also have low defense for close ranged combat. They also seem to be ruled by the elements of Earth, Metal, Water, or Air. Mountain Katreyes are very strong and have a high defence compared to the others. They are fast, but not as fast as the Forest Katreyes. Magic is not easy for the Mountain Katreyes for they are not as intelligent as the others, but they are masters at all forms of physical combat. These Katreyes tend to be ruled by the elements of Earth, Ice, Darkness, or Lightning. Desert Katreyes have been secluded from most civilization, and are not the fastest or the best fighters. But, they are known to be the most intelligent and are masters at elemental spells and tend to weild magical weaponry. These Katreyes are ruled by the elements of Earth, Fire, Molten Rock, and Light.
And those are the three basic Creatures in this world. I'll get into the less common ones next time.