SPOILERS! This article may contain spoilers for the Scarf Heroes Anime. It is recommended that you halt your reading to avoid any spoiler.
Somewhere in Canada, a man by the name of Matthew Grommel created an android. Said android went through various changes overtime, much like most characters of media. Thus, Keisuke was created. He and his creator later moved to Osaka, Japan. Unfortunately, Matthew was killed in a car accident before Keisuke could even know him...
A friend of Grommel, Dr. Hirofumi Koyama (whom Grommel had worked with to created an earlier android, Rez) later took charge of finishing off Keisuke whilst he remained dormant, and passed him on to his descendants before he finally awoke in the custody of Atsuro Koyama, the great-great grandson of Hirofumi. At this point, Keisuke was living in Crestfall as opposed to where he was worked on over the past few years.
Things eventually took a turn for the worst when Atsuro was killed as the result of a raid by a terrorist group known as the Smashian Victory Force. Keisuke and Rez attempted to come to his aid, but it was far too late. They had also seen a woman with a large katana whom was likely responsible for this. She eventually looked at the two, rushed at them and defeated them handily, yet they somehow weren't too badly damaged. Ever since the tragic day, the two rigorously worked day and night to create weaponry strong enough to fend off such powerful foes. A day after, Suzuka reactivated, but due to her rather upbeat nature in comparison to everyone else, he decided not to break to her of the guardian she never knew. Keisuke is still guilty of it to this day.
Keisuke also has a need for speed, and prior to joining the Scarf Heroes, he often engaged in street races in the Emay Mountains with his first car, a tuned Toyota MR-S (pretty ironic considering his past), although this was mostly to get over the fact that one of the closest people he knew was killed. He generally tended to do rather well, but no matter how he tried, he never was able to beat ONE particular racer: Eggurai, and had since formed a rivalry with him. His last race (which was in Crestfall and had occurred a few days before joining the Scarf Heroes) against Eggurai ended unexpectedly: several black Audi RS6 Avants appeared out of the blue and started ramming his car repeatedly and the drivers even opened fire on him, ultimately ending with one of them finally totaling Keisuke's MR-S. Assuming he had been killed, the assailants fled the wreckage. Keisuke had managed to survive and also recognized the vehicles from earlier from Smashian Victory Force, and assumed they had later blacklisted him for interfering with them before. When he got his hands on a newer car (see Zerovia), he weaponized the vehicle drastically and had put his street racing life behind him, but some fragments of his past still managed to break through.