Nightbreed

Nightbreeds (often abbreviated as 'breed') are creatures that dwell in the darkness, unable to walk in the sunlight without being vaporized. In order to live in the light they seek to possess human bodies. They also have a strong desire for flesh, usually human flesh. The breeds that have been shown appear to enjoy causing humans distress and anguish and are very self-serving creatures.

Types
Breeds appear to have different levels as some are easier to kill then others and there is such a thing as low-grade breeds. The difference between them is not readily clear.

Low-grade breeds have less power but a nasty disposition. They eat animal organs and do not have a hunger for human flesh, which may be the distinction. They make up for their weakness by exploiting human nature. In combat, they run on all fours and are fast and agile although have little by way of offensive capability.

Other Breeds appear have two different types of forms. In one form, they look like a small moving mass of phlegm, which they mostly used to possess a body. Most have a second humanoid form. They are able to speak in this form and usually have potent combat capabilities.

Possession
They can possess bodies in three different ways: When a possession takes place, the breed enters through the host's mouth. If it is a contract, the contract can be ended if the breed is forcibly removed or if the host fights against the breed and exorcises it themselves. The second situation is rare as most hosts refuse to give up the nightbreed's power, believing they can control it. Shido uses the first scenario readily, biting into the host's throat and sucking the breed out of the body so he can kill it without harming the host.
 * 1) They possess people who are brain dead or have recently died, reanimating the body.
 * 2) They can form "contracts" with living humans, where the human willingly becomes the host for the breed. In exchange for the humans fulfilling the nightbreed's desire for flesh the breed will give the human some of their power.
 * 3) The breed can simply overwhelm the host and forcibly take control. This has been seen only once, when a nightbreed Shido Tatsuhiko had injured possessed a nearby pigeon to escape.

Weakness
Like other Nightwalkers, nightbreeds are weak against silver and sunlight. Silver-coated bullets are able to cause more damage, unlike regular bullets. Most Nightbreeds are very arrogant and sure of themselves, which can lead to them underestimating their opponents.