A lone bounty hunter and former member of the Sacred Order of Holy Knights, Sol has dedicated himself to the extinction of the Gears. At over 150 years old, Sol was involved with the creation of the Gear Project, and he is in fact the prototype Gear. He fights with his sword, Fuuenken (Fireseal), with his fire magic. His real name is Frederick. In Guilty Gear XX Slash and Guilty Gear XX ?? Core, there is another version of Sol , from back in time when the Holy Wars were still raging, called Order-Sol, who fights with a much larger sword. In Guilty Gear 2: Overture, Sol is still free, but now travels with the young Sin, and sports a revamped version of FuuEnKen.
