Future Android 17

Future Android 17 is the alternate timeline counterpart of Android 17 seen in the movie, The History Of Trunks and the episode, Ghosts from Tommorrow and "Free of the Future". Him and Future Android 18 are the top 5 of the hated villains in the Dragonball franchise.

Personality
In contrast to his main timeline self, Future Android 17, alongside his sister, is extremely sociopathic, cruel, and more evil, taking joy in killing and destruction. According to them, the two sibling androids' personalities is the direct result of Dr. Gero's attempts at programming them to hate humans as part of his bid to conquer the world.

Story
Six months after Goku's death in Age 766, Future Android 17 and Future Android 18 are released by Future Dr. Gero to kill Goku as part of his plot for revenge. According to Super Perfect Cell's flashback, Future Android 17 and Future Android 18 are wandering through Dr. Gero's Laboratory as Gero is working on his "ultimate android". Future Android 17 counters Future Dr. Gero by saying he is the ultimate android while Future Android 18 knocks over some glass. Gero attempts to use his remote, but Android 17 decapitates him. As Gero's decapitated head says that his "ultimate android creation" will absorb them, Future Android 18 blasts Gero's head.

‎After he proceeds to kill the doctor, Future Android 17 and his sister head off to Amenbo Island, where they begin their reign of destruction. Soon after, coming to the defense of the inhabitants, the Z Fighters challenge the ruthless killing machines. Future Android 17 kills Future Vegeta with a hard knee to the gut followed by a Photon Flash. He kills Future Yamcha with a kick to the neck followed by a Photon Flash too, and Future Krillin afterwards. The androids kill Future Piccolo, Future Tien Shinhan, Future Yajirobe, and Future Chiaotzu as well.