Lapiroids are strange, space borne creatures. They form hard shells and attach themselves to the hulls of spacecraft in order to migrate from planet to planet. The shells are hard enough to withstand the extreme heat of planet fall. Once planet side the creatures enter a mating stage, where they develop limited mobility. Lapiroids have been known to chew through space craft hulls to suck energy from the systems within. Extensive infestations have been known to cripple entire commercial and military fleets.
Devil Wirms are aerial parasitic creatures which infest the pungent marshes and waste holes of Hell's lower levels. They tend to attack in large swarms, and will cover an intruding creature from head to toe to quickly drain it of all bodily fluids.
Infernal Bores are a breed of Blood Ticks which are bred for their strange mind control abilities. The creatures bore into the back of the skull and render their victims high susceptible to suggestion. This is effective against demon and soul alike. If the Infernal Bore is not quickly removed it will implant it's host with it's eggsack, after which the young hatch and the victim is consumed from the inside out.
Ichixideas (otherwise known as "Blood ticks") are common parasites which infest all levels of Hell. Blood ticks range in size from a few millimeters to the size of a grapefruit after feeding. Ichixideas use their powerful back legs to latch onto prey in a grip which makes them virtually unremoveable. 
Shraggots are creatures evolved from intestinal parasites. They live in rudimentary troops with an alpha male head, similar to chimpanzees or baboons. Sraggots tend to have a rough territory centered around a lake or stream where the females will deposit eggs into the muddy banks, just under the water line. The young spend the first six months of their lives in the water, only venturing out on land when they reach breeding age. The eggs are often poached as they are considered a delicacy by several species.
Nerve Runners are the result of parasitic organisms which radically alter a host's DNA, to the point where the creature soon becomes unrecognizable. Symptoms are begin enough in the beginning - headache, cough, runny nose. By the third day the body goes into wild spasms and sharp bolts of pain travel along the nervous system as the transformation begins. As the parasite begins to activate junk DNA in a host's cells multiple mutations may occur. A Nerve Runner may thus have any number of arms, legs, eyes, limbs, faces, etc. The entire body may be radically altered alongside occasional body parts which are relatively unaffected.
Succlumites are small insectoid aliens that evolved from parasites. They have a very hyperactive nature, as well as a relatively short life span (5-15 years.) Succlumites enjoy feasting on the blood of other species, often importing it and trading it like fine wines.
The Scrudinegook is a type of space borne, slimy parasite which attaches itself to comets, meteors, and dust particles. When such an object makes planetfall, the spores may lay dormant for millions of years. When a proper host comes along and inhales Scrudinegook spores, transformation will begin at a cellular level almost immediately. The host becomes covered in a bluish, slimy substance, while the alien activates and mutates pieces of the host's junk DNA. The resulting creature could have any number of different features, eyes, wings, limbs, etc, including some body parts which are virtually unaffected.
The Siphonatrix are a species of space borne parasites. The creature emits spores which drift through the void until they come in contact with a rocky body (such as a moon or asteroid) or even a space craft. They creatures then feed upon the solar wind as a type of microscopic "space plankton." They are generally harmless in this state, however if exposed to a rich nitrogen-oxygen atmosphere they mature into overlarge monstrous versions of themselves. Once in this state the creatures will swarm and attempt to consume any electromagnetic power sources, as well as organic materials (such as people.) A general standing rule throughout the galaxy is to eliminate any Siphonatrix colonies on sight.
Tarkarchos are space borne parasites. They usually inhabit areas where organic compounds may be found, such as nebulae, planetary rings, or asteroid fields. Early stages of infection appear as a common cold, however within a few days strange lesions appear on the skin. Eventually the lesions develop into Tarkarchos larvae, which if left untreated will burst fully formed after consuming the host's body from the inside out.
A race evolved from small parasites. On their home world the Phallegellilans live in gigantic bio-cities, which are genetically engineered from the massive whale-like creatures within whose intestinal tract they evolved. They feed primarily by sucking fluids from the walls of their bio-city. Phallegellians spend most of their lives indoors, and many display symptoms of Agoraphobia when outside.
The Skviqkank are a race of parasitic creatures. They begin their lives as small larva which embed themselves into the brains of a host. Over the month long gestation period the larva slowly hollows out the host's brain cavity and takes over all motor functions and memories. When this stage is complete enzymes are secreted which alter the host physically until the final creature is transformed into an adult Skviqkank.
Vollssock Demons are large, semi-bipedal carrion eaters, who dwell in Hell's deep caverns and shadowy places. They reproduce by infecting larva into the souls of humans (or even other demons.) Over a short gestation period the host becomes increasingly deranged, until eventually a newly formed Vollssock demon bursts full grown from it's skin.
Large, caterpillar-like "grubs" which infest deep jungles, but have also been reported in sewer systems worldwide. In their juvenile state the Grubsucker will attach itself to a larger animal such as a rat or dog at the base of the neck. There it will feed for several months and grow larger, soon working it's way into the animal's skull where it feeds on the brain, of which it eventually bursts forth from in a gory fashion. Larger adult Grubsuckers reach a length of 2-4 feet, and will "suck" up small animals such as fish, rats, frogs, etc, although they have been known to attack larger prey as well.
