Jinzouningen 18-gou

Jinzouningen 18-gou

人造人間18号
Jinzouningen 18-gou is a cybernetic human, modified by Dr. Gero. She is often referred to in the original Japanese as a jinzouningen, which literally translates as "artificial human." She is not entirely an android; she refers to both herself and her twin brother as having been "constructed from a human base."

No.18 is a mass murderer in Future Trunks' timeline.

After Cell is defeated, Kuririn uses the Dragon Balls to wish for No.17 and No.18 to be turned into humans; Shenlong is unable to perform this task because of the unfathomable differences in power between him and the duo, so he wishes instead for their self-destruct devices to be removed. Kuririn pursues No.18 and, at some point, they marry and have a daughter named Marron.

To clear up the heavily espoused misconception that No.18 is a pure android and therefore could not have a child, Kuririn went on to explain to Son Goku during the World Tournament Saga that she was originally human but that Dr. Gero just "remodeled her a little bit."
(Source: Wikipedia)