Sol Badguy

Prototype Gear Sol Badguy Bounty Hunter Sol Badguy Flame of Corruption Sol Badguy

Story
Introduced in the first installment of the series, 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 "Flame of Corruption". However, he later became disenchanted with the methods of the Sacred Order, and fled the order, taking with him the Fūenken. The theft earned him Ky Kiske's enmity.

In 2175, Sol faced Justice directly. During the fight, which Justice won, he discovered that Sol was a Gear. Justice attempted to assert her power as a Commander Gear to control Sol, but was unable to do so. Exploiting her confusion and weakness from the fight, the Holy Order, led by Ky, sealed Justice away, bringing the war to an end. However, a Gear named Testament began a plan to free Justice, and to stop it, the Union of Nations held a tournament. The canon stated that Sol was the winner of the Tournament, which also resulted in Justice discovering that Sol was, in fact, Frederick. Justice, in her dying words, commented that she wished that "... the three of us ..." could talk one last time, and Sol swore to kill Asuka.

In Guilty Gear X, Sol has three endings, all of which involve a fight against Dizzy, who has a half-million dollar bounty on her head. However, he spares her life in all of them, losing against her in his second ending, and judging that she is not a threat to the world in the other two. In the subsequent game, Guilty Gear X2, his story-line involved chasing down I-No. In his first ending, his defeat of I-No led to a direct confrontation with Asuka, who casually deflected all of Sol's attacks, saying that Sol was needed because soon a greater battle than the Crusades will occur. In Sol's second ending, Slayer informed him of the Post-War Administration Bureau's interest in Dizzy. In the third ending, he fought Dizzy, who had been possessed by Necro, after I-No knocked her off the Mayship, and sent Dizzy on her way to meet Johnny and May.

In Guilty Gear XX Accent Core Plus, Sol had two endings. In one, I-No threw him back in time to fight his past self, Order-Sol. After both are weakened from the battle, I-No reappeared to murder Order-Sol, which, in turn, caused Sol's present form to cease existing. In his other ending, the same set of events played out, but Sol's present form, strangely, is unaffected by his past self's death. After escaping the time rift, Ky confronted and engaged him in battle. After the fight, Sol and Ky finally settled their differences and went their separate ways, with Ky asking Sol to promise that they will meet again. Though it was referenced in both Sol and Ky's endings, only Sol's told the events directly after the battle, which implied that Sol was the victor.

In Guilty Gear 2: Overture, Sol Badguy took in a young man named Sin as his apprentice, and traveled the world with him as bounty hunters. During their journey, he met Izuna, who told him that a man called Vizel was seeking out and destroying Gears, by order of Valentine, and that his next target was the kingdom of Illyria. Sol, Sin, and Izuna go to Illyria and find Ky Kiske trapped with a binding spell. With Dr. Paradigm's help they were able to release him. Eventually, they captured Valentine, who transformed herself into a monster. Sol fought her, and after the fight, he found himself in a white space, unable to return. However, he was confronted by That Man, who confirmed that Valentine was a copy of Aria, Sol's former lover. Sol was returned to the real world, where he reunited with his allies.

In Guilty Gear Xrd -SIGN-, Sol continued his journeys with Sin when Ramlethal Valentine declared war on humanity. Working alongside Ky, Sin, Leo Whitefang, and Elphelt Valentine, Sol fought to stop the Conclave from using the Cradle to resurrect Justice and destroy humanity. In the end, Sol and his allies were able to stop Justice from reviving, but Elphelt betrayed them and tried to kill them. She was eventually taken to the Backyard, and Sol, Sin and Ramlethal set out to find her. In REVELATOR, Sol was confronted by Raven, who told him that That Man needed his help in preventing Elphelt from merging with Justice.