From the dragonball universe, Android 19 is one of Dr. Gero weaker, but more obedient androids. He is weaker than a super saiyan, and gains energy by absorbing energy attacks, or by holding on to their victims.
Android 19: Do not try to escape. Yes, it is useless. Until I have your energy, I will never let you go.
Said after grabbing Vegeta to steal his energy. His arms are pulled off shortly after.