In contrast to his main timeline self, who was very rebellious, and had a desire of being carefree and independent, and is quite cocky and confident of his abilities, Future Android 17, alongside his sister, is extremely sociopathic and cruel, 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.