Known as "Doc," Fujita is the grandfather of Junna and is the owner of a machine parts store.
Eighteen years before the start of the series, Fujita opened a robotics shop for children. Whenever Fujita had opened his shop, he would gather his robots in the front of the shop for the children to see them. Seven years later, one of Fujita's robots fell on top of his granddaughter Junna. Fujita would blame himself for what had happened and his granddaughter would distance herself on the belief that she had made him angry. Immediately after the incident, Fujita would store all his robots in the back of his storage room, along with a photo of himself and his granddaughter.
Sometime after storing his robots, Fujita would be contacted by Misaki to help her create a robot. At first, Fujita had refused to help, but he had changed his mind after witnessing Misaki's spirit and her determination.
Fujjita Tetsuharu is created by 5pb, and he has no information regarding any inspiration used to create him. He first appears in Robotic;Notes visual novel game and makes his first anime debut in episode 2. He is voiced by Nobuaki Fukuda