Cybertronian

The Cybertronians (more commonly known to the Human race as Transformers) are a species of autonomous robotic life forms originating from the artificial planetoid Cybertron.

Anatomy
Cybertronians are a machine race that carries a "spark" inside their bodies. As long as this spark endures and remains intact, the Cybertronian can be rebuilt, no matter how much damage the unit has sustained. If the spark is extinguished or otherwise destroyed in some way, the Cybertronian cannot be rebuilt and remains permanently dead.

Ecology
Cybertronians primarily consume a rare substance called Energon, which serves as both a fuel and their "life force". In its raw form, Energon is actually harmful to them, although not to organic life. In its processed form, Energon is essential to a Cybertronian's survival.

Powers and abilities
A Cybertronian's primary ability is the "art" of transformation, in which they assume an alternate mode that grants them increased mobility. Alternate modes can also be used for stealth, as they can disguise themselves as unassuming machinery. With the necessary equipment, Cybertronians can alter their appearance by scanning different vehicles. Technically speaking, nearly all Cybertronians possess this ability.

Because they do not need to breathe, Cybertronians can survive underwater and in the vacuum of space.

Cybertronians possess superhuman strength while in robot mode and superhuman speed while in vehicle mode. Nevertheless, they possess enhanced agility and reflexes in both modes.

A Cybertronian's body has natural armor made from a special alloy that allows them to withstand most conventional attacks and certain alien technologies.

Cybertronians have a limited self-repair system to fix minor damage.

Because they are not exactly natural lifeforms, Cybertronians do not have a natural predator. For example, Archa Seven Arachnids are not considered a natural predator to Cybetronians.

Weaknesses
Not all Cybertronians can transform, as those predating the Second Cybertronian Civil War may not have this ability. There is also a limit to what kind of alternate modes a Cybertronian can assume, as they cannot assume a form larger than their robot mode.

Cybertronians are vulnerable to unnatural diseases and "uberpredators" such as Unicron, Primacron, and Cosmic Rust.

Cybertronians from the Malgus Cluster are unable to safely become a triple or six changer because adopting multiple alternate modes would strain their bodies to the point of affecting their mental state, as demonstrated with Blitzwing.

Cybertronians are vulnerable to magic and other exotic forms of power. Similarly, they can be affected by reality manipulations.

Cybertronians are vulnerable to being controlled by parasitic life forms.

Cybertronians are sensitive to electromagnetic projections. They can also be either disabled or restrained by Cybertronian stasis cuffs.

There is a limit to a Cybertronian's durability, as their armor is vulnerable to the most extreme temperatures. As such, this armor can be damaged or breached with either sufficient pressure or special materials and weapons. Similarly, their internal workings and other functions are vulnerable to being hacked, damaged, or overloaded.

Custom-forged and augmented Cybertronians can have trouble fighting against sufficiently powerful opponents and forces, indicating a limit to their physical strength.

Cybertronians can be immobilized or hampered in both vehicle mode and robot mode if they receive severe damage to either of their forms.

Despite being machines, Cybertronians are still susceptible to exhaustion. Similarly, if they either receive enough damage or go too long without refueling, they will shut down and possibly enter stasis lock.

Culture and society
Throughout the multiverse, Cybertronians are divided into multiple factions, most commonly the Autobots and Decepticons. In many timelines, the Autobots are succeeded by the Maximals whereas the Decepticons are succeeded by the Predacons and later Vehicons.

Technology
Cybertronian technology has developed to the point where they can convert most forms of energy into Energon.

Religion
It is a common belief amongst the Maximals that their sparks are either part of or fragments of Primus, the mythical creator of the Cybertronian race.

History
The Cybertronian species is an old race with an odd and murky tale that is their origin. Some say that their race was created by the Quintessons, others say they were created by a deity known as Primus and more say they simply evolved like most organic species, to put it simply, we haven't got the faintest clue how they came into being or who or what might have caused their creation.

The earliest records we have of Cybertronian history is during a point in their history when they were enslaved by the Quintessons, the future divided factions were originally sold in two product lines, the Autobots were sold as consumer products and the Decepticons were military hardware, and so the Cybertronians, after fully achieving sapience, rose up against their oppressors and became more then just "robots".

Unfortunately, the two sides just didn't see eye to eye, and so began the many Civil Wars of the Cybertronian people. During the second of these civil wars, the Cybertronians had a micro-evolution which gave them their most notable ability, the power of Transforming!

With this new ability at their fingertips, their people began a Golden Age, for themselves, and their planet. However, this age came to a screeching halt when some Decepticons created their new leader, Megatron.

Under this new leadership, the Decepticons rose up, and took most of the planet for themselves. Along the way, Megatron nearly killed a dock worker known as Orion Pax, who later became a prime and led the Autobots off the planet in search of more energy. Little did they know, the Decepticons were in pursuit of their spacecraft.

Following the short confrontation, the Autobot ship with the Decepticons still inside crash-landed into a mountain on Earth where they remained in a vegetative state for millions of years before awakening in 1984 and continuing their battles.

Eventually by the year 2005, the Autobots had established a permanent base on Earth whereas the Decepticons had fully conquered their homeworld Cybertron and the Autobots had established outposts on Cybertron's two moons, before both moons were devoured by the Monster Planet Unicron.

After the battle, the Autobots had finally taken back their home and the Decepticons fled to the planet Charr, and after more conflicts with the Decepticons, the Quintessons and the Nebulons, they finally had peace and all was well.

Also there were some smaller conflicts in the past between the time-travelling descendant of the Autobots and Decepticons on prehistoric Earth, but that's not really important to the story.