Banshee - Women who's souls merge with a spirit of death become Banshee's. Banshees are capable of sensing death around them and channeling the energy from a a spirit becoming a soul into themselves in order to become more powerful. Furthemore, they are also known to be able to use powerful screams capable of flattening entire towns if uncontrolled.
Esper - An Esper is a genetically altered human who's genetic structure enables them to use abilities that seemingly have no limits in terms of capabilities (also known as Mutant.)
Hollow - When a person dies, their soul leaves their body and becomes a spirit. Hollows are a race of creatures which are born from Human souls who, for various reasons, do not cross over to the afterlife after their death and stay in the Realm of the Living for too long. They are corrupt spirits with supernatural powers which devour the souls of both living and deceased Humans.
Kindred - Child like humanoid creatures with an affinity for a unique form of magic that stems from the life-force generated by the World. They only age up until a certain point which is why in Olympus they were considered the "First Children". Kindred are capable of flight, force projection and a range of powerful enchantments.