These are only the main ones. There are others that you are free to come up with.
Vampires, contrary to Werewolves, are a form of evolved humans, Mankind's only predator. Unlike many vampire stories, transformation into a vampire is not a conscious decision on the part of the vampire, but is cause merely by a vampire feeding off of a human. In recent years, a "vaccine" has been developed to prevent transformation, but is only effective for up to 48 hours from the time of infection. Other than the "vaccine" a sort of sunscreen or gel has been invented to keep vampires unharmed in sunlight, but one must have it applied to all exposed parts of the body and it only lasts a few hours at best.
Compared to humans, vampire emotions are significantly more potent, causing many vampires to become violent, gluttonous for blood, and very often sexual deviants, in an effort to satiate those powerful urges; however, there also those vampires – chiefly among those who were turned against their wills – who instead choose to become Fangless, pulling their own fangs in order to hold onto their former human values. Such vampires face persecution from both sides, however, human and vampire alike; it is revealed early on that the creation of the Vampire county was in large part to provide a haven for the Fangless to live peacefully.
All vampires have a 'True Form,' which is a physical representation of their inner self, and is a very similar transformation to that of werewolves. This form can be almost anything, from a giant bat, to a spider. Each vampire also has a ability all of their own and is mostly unique to only them, however in recent years people have been able to alter the vampire body, making them living weapons. In addition to regular vampires, there are also the "True Bloods": vampire families who possess "pure" vampiric ancestry, undiluted by human blood, whether by mating with humans or by being transformed. These are the most powerful of all Vampires in the world, but are deathly restricted by tradition and codes of conduct when it comes to dealing with each other.
The Royal family rules over the world of darkness, this includes all beings such as vampires and the like. Currently, there is only one member of the royal family left.
The Three Clans
The Three Clans are the most powerful of the vampire clans, save for the Royal Family itself. In the past the three lords devoured the other noble clans and pursued the Royal Family. They succeeded in their campaign resulting in the extinction of the "true bloods" and the death of the Queen. However to keep the true bloodline, one was left and that would turn out to be their greatest mistake as they were soon crushed under her heel and put back in their place as the Royal guard turned against them in protection of the princess.
Only a single Clan of werewolves are highly evolved enough that they have developed to look like men. They have been in the service of the royal family of vampires for generations; they act as the royal empire's military and special-ops units. They are born with stronger bodies than humans, keener senses of smell and sight, and (unlike vampires) can walk around during the day. Werewolves can take LARGE amounts of damage and still live, and are also said to have extremely long lifespans, most likely werewolves are immortal but none have survived long enough to find out.