Android 17
Jinzouningen Juunana Gou "Artificial Human Number 17"- The brother and sister team, (Androids 17 and 18). Doctor Gero obtained a brother and a sister. His means of obtaining them and their past lives are never revealed. He experimented on them, and basically re-created several aspects of them. They refer to themselves as, "Humans with a few extras". He obviously also took away many of their past memories since they never refer to themselves by their former names, nor do they show any care for what they used to be. This brother and sister obviously became what we know as Androids 17 and 18. 17 is the brother. He's a typical male with a love for fast cars, and all sorts of adrenaline rushes. He loves his ultimate power and refers to himself as the strongest being ever. Unfortunately for him, that's not true when full power Stage One Cell shows up. Contrary to popular belief the Androids of the present are VERY diiferent from the Androids in Trunks' time. In Trunks' future 17 drives around in an air car and mows people down for fun. In the present he may rough up people, but he never kills a single human. The only person he intends to kill is Son Gokou and after that he just wants to enjoy himself by fighting strong opponents. Both 17 and 18's deadliest trait is that they do not have ki, and thus cannot be sensed, and they also have an infinite supply of energy inside of them. In other words, even if they're lying near death on the ground, if they have enough strength left to lift their arms, they can still shoot out blasts of energy. Number 17 also has a bomb inside his body which can be triggered by an Emergency Stop Controller, but the explosion is not as powerful as Number 16's is. After the Cell saga Number 17 becomes a recluse and lives in the woods by himself. The only time he's seen again is when he gives his energy to Gokou to help create the Ultimate Genki Dama.