Background:  Genepool's was originally created to be a sort of collector, a collector of genetic material.  His existence began as a faceless, emotionless, husk.  This form was tall and lanky and bald, with pale white skin and red eyes.   After absorbing the genetic material of his first victim, he was transgressed into a larval state and went into a cocoon.  Inside, his body began to radically change, coming to resemble that of the Saiya-jin whose DNA he had absorbed.  His initial impulse satiated, he began to wonder the world and develop a personality, transgressing from a mindless collector into an intelligent sentience.  Genepool continues to roam the planet, collecting DNA from those unfortunate enough to fall to him in battle, storing it in his genetic structure until such time as his creator can return to extract it.

Note: DNA extractors are like the things that 19 and 20 had on their hands.  The actual process drains the victim reducing them to lifeless and juice less husks (think dry freezing of jerky :P ).  This can only be done however after the character has been reduced to death, but must be done before decomposition sets in.  (Thus it becomes a role-playing tool and nothing more).