Android 16
peaceful android created and stored by Dr. Gero but unleashed by Androids 17 and 18. He fought and got destroyed by Cell, but was repaired and reprogrammed into a Z warrior by Bulma. In the second battle, Android 16 was killed again, but his death triggered Gohan to reach SSJ2 mode for the first time.

Android 17
menacing cyborg brother of Android 18 created by Dr. Gero. Android 17 betrayed and killed Dr. Gero. He was absorbed by Cell, but was later revived. Android 17 returned at the end of the Boo Series. In Dragonball GT, he fused with Artificial 17 to become Super 17.

Android 18
wicked cyborg sister of Android 17 created by Dr. Gero. She was absorbed by Cell but spit back out. She married Klilyn and became mother of Marron.

Android 19
fat android created by Dr. Gero. Specialty: ability to absorb energy from opponents
(killed by Vegeta) Dr. Gero
evil engineer of Red Ribbon. He developed a hatred towards Gokou since Gokou destroyed Red Ribbon. He devoted the rest of his life trying to destroy Gokou by creating a number of androids to do the job, but was betrayed and killed by Android 17. In hell, he allied with Dr. Myuu to create Artificial 17. 17 betrayed and killed him once again. (killed by Android 17/ Super 17.