Here's what you can play, this list is not exhaustive of course, do not hesitate to create things that do not come in here. Obviously, these races are not mandatory but are examples, do what you want.
Human:
Humans is the most widespread and most common creature in the land. They built the great city of Appledale and pretty much everything modern nowadays. An extremely polyvalent race, which come with great respect (and fear) of all other races. They can either be great warriors, wizards, inventors,...
http://www.digitalgames.fr/wp-content/images/ragnarok_online.jpgHybrids:
These are all living humans in the origin, but possessing animal special features, cat ears, a tail fox, etc., and are included in society. They often make great warriors due to her physical superiority toward the average human. The Hybrids appeared when the demons broke free in the human world and are victims of social inequality, often threatened by slavery and poverty. The free hybrids tribe live in the wild chaotic regions, and those who live among Humans often live in slums where they make a living by stealing or doing menial tasks. It is rare, but some Hybrids managed to get themselves a very well-placed job, sometimes becoming celebrities.
http://accel98.mettre-put-idata.over-blog.com/0/40/28/34/utawarerumono1wk.jpg http://ekae.net/files/Furry.jpgMonster:
Anything that is too beastly to be considered "civilised"; werewolves, monsters, tentacles etc etc.. Live in chaotic regions and only work by their instinct. Create what you want as a monster type.
Werewolf:
http://www.wizkidsgames.com/horrorclix/images/HrC_werewolf_1024.jpgTentacle monster:
http://www.yuribou.net/blog/pics/tentacle2.jpgAngelsRevered either by the Church and most humans they are considered messengers of the Divine, and extremely respected toward every creature. They have an almost military-like training since their birth so they can serve the Seraph plan to destroy all demons. They consider demons as the embodiment of evil, and humans as irresponsible childs they have to overlook.
http://people.uleth.ca/ ~ randy.hahn2/photo/SetsunaCard.jpg
DemonsFeared by all, demons don't need to prove themselves one of the most fearful opponent this world have to give. Unlike their Angel rivals, they don't plan on taking over the human world or destroy the Angels: they rather enjoy the carefree life the Netherworld give them. They are all after the crown of Demon Emperor, and their treacherous behavior make them the less reliable ally; they don't hesitate to cheat, backstab and lie to get to their objective.
https://2img.net/r/ihimizer/img100/5931/shikihb5ry5.jpgLegion:
It is an account containing more than a dozen character, such as an army, a band of orcs, or an entire group solid regardless NPCs.
https://2img.net/h/i23.photobucket.com/albums/b391/SventheCrusader/ZelgiusandfreakinghugeArmy.pngCreature:
Any other race non-listed above, but are considered civilised (that means that can interact without obviously going to attack you like goblins). Such as the xenophobic elves, the mischievous fairies, ect.
http://laforcedesfemmes.l.a.pic.centerblog.net/o/23c04986.jpg