You can use Perfect at you wish, I don't no where he'd fit into play though.
https://2img.net/h/oi34.tinypic.com/i6e8g1.pngHis back story which you can alter is,
Upon Cell's self destruction one cell remained
living and growing through the years, by the beginning of
Majin Buu's resurrection this cell had been fully developed.
Since the self destruction took place in Other World, he remained there
until he harnessed his powers and became aware of whom he was.
He eventually escaped using the instant transmission technique
around the time of Kid Buu's death. He has all the knowledge of Cell as well, being a clone or offspring if you will. What hes been doing from the end of Kid Buu to GT to your comic is up to you, if you proceed to use him. Hes generally neutral but, he can be evil/good.