Android 18 is a fictional character from the Dragon Ball series created by Akira Toriyama. She is a cyborg, originally introduced as an antagonist, but later becomes a key ally to the main characters. Android 18 is known for her strength, agility, and combat skills, making her one of the most powerful fighters in the series. In the storyline, Android 18 is the twin sister of Android 17 and was created by the villain Dr. Gero as part of his plan to defeat the Z Fighters. Over time, she develops a more human-like personality and eventually marries Krillin, with whom she has a daughter named Marin.