Nr. 17  He is one of the Cyborgs created by Dr. Gero  for the purpose of killing Son Goku. In Future Trunk's world, he's  simply an evil individual with no regard for human life. Along with  #18, he killed most of the world including Piccolo, Vejeta, Yamucha,  Tenshinhan and even Son Gohan, leaving Future Trunks as mankind's  only hope. He is quite a different character in the "present"  world. Although his character is not evil, his big ego got the best  of him. Believing that no one in the universe is stronger than him,  he could not accept that fact that he was unable to defeat Cell and  fell an easy victim to Cell, thus contributing to Cell's Development  to 2nd Stage.