Humans are, well, ordinary human beings, like you or me. While they may have predilections towards magic, psionics, or other special disciplines, as far as modern science is concerned they are not genetically dissimilar from each other, yet are significantly dissimilar to werewolves, vampires, and other supernatural creatures on a genetic level.
While most people can utilize magic in some form or another through sufficient study and understanding, some humans are more attuned to it and have an advantage when attempting to control it. These gifts and talents tend to pass through established bloodlines, although there are instances of undocumented bloodlines turning out a powerful magi now and then.
At the other end of the human scale, psionics is not known for being hereditary (at least in experiments done to date) and seems to almost be random in its development. The government has been heavily involved in experimentation to induce and refine psychic powers, as has many other world governments. Publicly, there is no acknowledgement that any of these experiments bore fruit.
Humans have a short, brutish existence. Despite that, or perhaps because of that, they are far more likely to attempt to suspend, disrupt, or destroy the processes that would bring them to an untimely death or decay due to age. Vampires may have been the first major attempt by humanity to extend their lifespan, although the truth of that rumor is disputed. Even in the modern day, creams, potions, poultices and powers that can suspend or reverse the aging process and thus effectively grant immortality to death by natural causes are highly valued, and those who can manufacture them sought out by the rich.