Introduced in the first installment of the series (1998), Frederick was one of the lead scientists of the Gear project, as well as being the prototypical Gear, dating from over a hundred years before the events of the "Guilty Gear" games. As a prototype, he is immune to the orders of Commander Gears. He was personally acquainted with Asuka R. Kreuz (whom typically known as That Man) prior to the Crusades. As Frederick, Sol created the "Outrage", which he called a supreme Anti-Gear weapon. The Outrage has eight components called "Jinki" (Godlike Weapons), which greatly amplify their wielders' magical ability. Later, he was himself recruited into the order, as a bounty hunter named Sol Badguy. Sol took part in the Crusades, during which he was a member of the Sacred Order of Holy Knights (Seikishidan), acquiring the nickname . However, he later became disenchanted with the methods of the Sacred Order, and fled the order, taking with him the . The theft earned him Ky Kiske's enmity.