Android 17

人造人間17号, 17, No. 17 (Juunana-gou), Lapis
Artificial Human 17 Android 17 in the English adaptations is a fictional character who first appears in the Dragon Ball manga created by Akira Toriyama as well as Dragon Ball Z and Dragon Ball GT. Originally a human he is constructed into a cyborg by Dr. Gero like his twin sister. 17 is a mass murderer in Future Trunks039 timeline. Number 17 is not an android created by Dr. Gero. He and his twin sister 18 were once human. How could they be twins if they weren039t once human? Toriyama said Gero found them as a couple of hooligans. They existed before Dr. Gero therefore they are not robots. An android is a robot and a cyborg is a human with robot parts in them. Considering what he can do 17 is probably about half human. Now as to the motivation behind 17 killing Dr. Gero that039s subjective. While they didn039t necessarily like being turned into cyborgs once it was done it couldn039t be undone. It was Dr. Gero039s strangle hold on their freedom as represented by the quotcontrollerquot device that inspired 17 to kill him. Threat + Rebel = dead Gero. They were both rebels. You should never try to put a leash on a rebel. Later 17 and 18 drive around in a van with Android 16 looking for Goku. When they finally get to the Kame House Piccolo tells them Goku is not there. He refuses to tell them where he went to and thus Piccolo challes 17 to a battle. As they fight Piccolo039s ki leads Cell an evil insect freak spawned by Dr. Gero039s computer who needs to absorb 17 and 18 to reach its perfect form to the battlefield. He offers 17 to surrender so he can become a part of greatness. 17 refuses and is defeated during the battle. Wikipedia