Android 18 (Jinzoningen Ju Hachi) is the second android designed by Dr. Gero to be created by fitting a human being with cybernetics. As a mortal woman, she and her unnamed brother (the eventual Android 17) were runaways whom Gero kidnapped and conducted experiments on, resulting in their transformation into cyborgs. However, her ability to procreate was not impeded by these experiments, as evidenced by her giving birth to a healthy daughter, Marron. Gero's blueprints for Android 17 in Funimation's dub of the Imperfect Cell Saga suggest otherwise however, instead citing that 17 and 18 "are made up of organic substances padded after human cells."
Initially cool and confident, 18's sarcastic humor later becomes the most striking trait of her personality. One example of her sarcasm is demonstrated when she is asked if her real name is legitimately "No. 18", to which she responds, "My father was pretty dull." Shortly before this conversation at the World Martial Arts Tournament, Goku takes notice of her assembly with the Z Fighters, leading to the retort, "Look, he noticed. How cute."
Android 18's birth name is never revealed, and following her allegiance to the Z Fighters after the defeat of Super Perfect Cell, she is referred to as simply "18".
