Nebulos

The planet of Nebulos and it's biological humanoid inhabitants were caught up in the war between the Autobots and Decepticons. Many of the native Nebulans choose to be binary bonded to a Transformer creating several subgroups including the Headmasters, Powermasters and Targetmasters.

Notable Nebulans

Hi-Q was a genius computer programmer who was binary bonded to the reborn Optimus Prime and became his Powermaster engine.
Zarak was a corrupt high-ranking politician who was bonded with Scorponok and became his head and pilot.
Throttle and Hi-test, two Nebulan traitors who revived the domant Darkwing and Dreadwing and became their Powermaster engines.
 

Nebulans in the Multiverse

The Nebulans differ slightly from each known universe. In the G1 Marvel continuity where most of the background story comes from, the Nebulans are a peaceful race and look almost identical to humans. They look much different in the IDW continuity with their hairless green or bright pink skin and white eyes. In the original Generation 1 animated series the Nebulans are green skinned with green or white hair. Many of their elders have cyborg implants and have even replaced arms and legs with robotic limbs.