
Sora herself never existed until a fateful event countless years back. (Some may even call it an accident.) Kage, the evil kaioshen at that time, was the West Kai. He used his limitless powers to destroy planets. But on one planet, his plans for domination ended abruptly when his blast, White Tora, had unexpectedly exploded at the wrong time.
The West Kai was holding the princess warrior, Sekai, of that planet and her closest light-hearted friend, Taiyou, safetly in his power to watch their world die.
But the explosion had killed all three, at the same exactly moment. The souls of each combined into the only body that partially survived, the kaioshen's.
Thus creating Sora. Sora trained under her mentor Tai-Fu while he was still East Kai, ignorant of who or what she was until Kage's soul became consious once more and successfully killed off both Sekai and Taiyou's souls.
Kage escaped from his old body, now Sora's, and found another. The battle between Sora and the now weaker kaioshen continues, the conclusion remains unseen.