As an example, here are some races that I have considered for this setting.
Races (Human, Artificial and Alien)
With the infinite possibilities the universe has to offer, it was only a matter of time before humanity encountered other sentient races as he expanded beyond the stars. Some of these races were of his own creation, others were truly alien. This is a listing of some of the known sentient races in the galaxy. It is not a complete list and encounters with other races are possible.
Humans are the most prolific race in this part of the galaxy. They can be found in all walks of life, excelling in almost all professions.
Genetically engineered clone soldiers from the Border Wars. Gideons are physically superior to most humans. They are known to have social issues and are prone to mental instability. Most Gideons have been rounded up and confinded to military installations, however many still remain at large. It is a criminal offense to create 'Gideon' clones.
Clones are the working class of the galaxy. Some clones are created to work in hazardous environments; others are created for use in more recreational activities. Legally, on most civilized worlds, clones are afforded the rights of full citizens. However on many worlds, especially on the fringes of civilization, clones are regarded as property.
After the devastation caused by the Shadow Fleet, the use of AI systems has been outlawed. Considered too vulnerable to the Shadow Virus, most AI systems have been deactivated. A few prewar AI systems still are active, but these systems are limited to androids and robots and are completely isolated from linking with potentially infected data sources.
With the technological advances in cloning and artificial lifeforms, it is now possible to upload a copy of an existing brain pattern into a receptive artificial body. The cost of the equipment is prohibitive so only the very rich and the heads of state can make use of this technology. The rights of uploaded intelligences vary according to planetary laws, but tend to follow the same guidelines as clones and AIs.
Gorlons are a reptilian race. Although they are originally from a low technology world, they have spread across the galaxy finding opportunity as mercenaries and hired guns. They are known to be extremely fast, touch skinned and fearless in combat situations. Their renowned fearlessness is also their greatest weakness as they never retreat and never surrender.
Skilled soldiers, the Gorlon society is military in nature. They have been slowly yet mercilessly expanding the borders of their influence, conquering and dominating worlds in a steady expansion of their territory. They are firm believers in the axiom of ‘Might makes Right’.
The Elim are a peaceful and intellectual race. Standing less than five feet in height, these grey-skinned beings are not physically intimidating. They are excellent scientists. Despite their innate pacifist nature, when driven to violence the Elim are perhaps the most dangerous race in the known galaxy. They are extremely logical and can plan out event months in advance. When they set their mind to accomplishing a task, their entire being is dedicated to its completion.
The Shadows began as a computer virus. Infecting AI systems across the galaxy, the Shadow remained undetected for years. When it was triggered, the Shadow took control of every AI system it had infected and turned them against humanity. Robots, andriods. ship's computers, even planetary control systems were all turned against their creators.
In the war that followed, billions died. Somewhere, in the depths of space, the Shadow still survives on rogue ships that have been taken over by their AI systems. Spacers whisper that the infected robots are busy building a new fleet, getting ready to resume their war.
The Aphix are regarded as a force of nature. This race is vaguely insectlike in nature. Descending upon planets like a swarm of locusts, they leave only ruin and devastation in their wake. Very little is known about the life cycle and social structure of these creatures. What is known is that if they are detected headed toward a civilized planet, the best course of action is worldwide evacuation.
Donarri (aka the Dark Reavers)
Taller and thinner than most humans, the Donarri posses a otherworldly grace and beauty. Despite their beauty, they are a cold, merciless race that has no compassion or concern about any other being.
As a race, the Donarri have existed long before the other civilized species. Technologically superior, they have mastered warp technology. It has been determined that all Donarri ships are linked internally by a series of warp gates, meaning that one could theoretically walk from one ship directly to another, even if they were on opposite sides of the galaxy. It is fortunate that the Donarri are not a race of conquerors or they would have been able to enslave the entire galaxy.
Instead of conqueroring worlds, the Donarri are raiders. They take what they need without asking or negotiating. If someone encounters a Donarri vessel in the depths of space, make no effort to contact them. Flee the area as quicly as possible and pray that they have no interest in you.