Android-18's petite form and beautiful face hide her massive strength. She has shoulder-length blonde hair (which, according to her, is artificial and cannot grow back), blue eyes, and hoop earrings in both ears. She keeps the left side of her hair behind her ear. When she is first activated by Gero, and throughout her entire life, she wears a blue denim vest and skirt (with the Red Ribbon logo on the back of the jacket) with dark blue tights, brown boots, and a black undershirt that has white and black striped sleeves.*

The only thing she seemed to enjoy besides carnage and death was material gain. She is very vain when it comes to her appearance. She enjoys admiring herself in the mirror while modeling different clothing, showing a measure of her former humanity from her interest in fashion. Likewise, she enjoys others complimenting her beauty, enough to actually spare them. Despite her cruel nature, Android-18 has a measure of self-restraint, such as scolding her brother for murdering a salesman she intended to let live and for him killing a boy she found attractive.

"Ugh.. I take it back, 17 is truly an idiot, he murdered my favorite tailor, gods he is such a douche.."Android-18 frowned completely irritated walking across the ruined plaza.