Android 16

Android 16 was activated by Androids 17 and 18 against Dr. Gero's explicit orders. Gero considered 16 a failure because the Android could not be controlled, and he warned the others not to activate him. Once awakened, 16 revealed himself to be a quiet, contemplative being who preferred observing birds and nature to fighting. His only programmed directive was to locate and destroy Goku, though he showed no urgency in pursuing this goal.

When Cell appeared and began hunting Androids 17 and 18 to achieve his perfect form, Android 16 stepped in to fight. His battle against Cell in his Semi-Perfect form demonstrated that 16 possessed power roughly equal to Cell at that stage, something that surprised everyone. He used his rocket-propelled fists, the Hell Flash energy attack, and even attempted his self-destruct device, only to discover that Bulma and Dr. Brief had removed it during repairs.

After Cell achieved his Perfect Form, 16 was severely damaged and rendered largely nonfunctional. During the Cell Games, Mr. Satan carried 16's damaged head to where Gohan was fighting. With his final words, 16 encouraged Gohan to protect the life he cherished and not to hold back his power. Cell then crushed 16's head under his foot, and the sight of this senseless destruction finally pushed Gohan over the edge, unleashing the Super Saiyan 2 transformation that turned the tide of the entire battle.

Android 16 occupies a unique place in Dragon Ball's roster. As a fully mechanical being, he cannot be sensed through ki detection, restored by the Dragon Balls (which can only revive living beings), or healed through conventional means. His design was based on Dr. Gero's deceased son, making him a monument to a father's grief as much as a weapon of destruction. This personal connection is why Gero refused to activate him, fearing the loss of the last remnant of his child.

Thematically, 16 represents the idea that purpose does not have to define destiny. He was built to kill, yet he chose peace. He was programmed for destruction, yet he became the emotional catalyst for the heroes' greatest victory. His love of nature, particularly his habit of sitting quietly among birds, contrasts sharply with the violence that surrounds him and makes his death all the more tragic.

Because 16 is fully mechanical and not a modified human like 17 or 18, he could not be wished back to life by the Dragon Balls after the Cell Saga. His permanent death gives his sacrifice genuine weight. In Dragon Ball Super: Super Hero, a similar Android named Gamma 2 echoed 16's arc by sacrificing himself to save others, suggesting that Gero's engineering carries an unintended tendency toward heroism.