KAI
In the opening scenes Kai, who had just witnessed the complete destruction of his race, was executed by His Divine Shadow, after deliberately crashing his ship into the control pod in a brave attempt to destroy his enemy. The Prophecy had stated that His Shadow would be destroyed by the Brunnen-G, but due the arrogant nature of this entity, instead of incinerating Kai's lifeless body, he decided to reanimate him.
For over 2000 years Kai was used as His Shadow's Chief Assassin, having no memories of his former life. He was purely a vessel controlled by His Shadow, an animated corpse who was kept "alive" using a substance called Proto-blood. His body is preserved in a cryogenic freezer, where he spends most of his time, reducing the need for Proto-blood (which is in very short supply). He has no heart beat and he does not breathe, but he can move about normally. However, His Shadow did not anticipate Kai becoming sentient again.
Not only did Kai regain his own memories, but assimilated thousands of other memories, including memories from the ruling His Shadow who had killed him over 2000 years ago. Kai is highly intelligent, skilled, and extremely knowledgable, a being of deep thought but few words.He is extremely dextrous and skilled in his profession. After all, he has had over 2000
According to Thodin, Kai was de-carbonised, and has the ability to regenerate, including re-attaching severed body parts. As he is already dead, he cannot be killed in the literal sense.
However, Kai needs Proto-blood to sustain him, and if this runs out, he will never be able to regenerate.
Although Kai's ancestors were originally from the Dark Zone, (they vacated their planet because their sun was becoming supernova) Kai had never visited his ancestral home. Until now.