Pyon Silver is one of the Gun-Swordsmen, the combat specialists from the world of Brigadoon, and he appears as a supporting figure in the conflict surrounding Melan Blue. He is the third Gun-Swordsman featured in the story and operates alongside Erin Garnet, sharing her belief that Melan is a traitor who must be dealt with. Unlike Erin, however, Pyon is far more composed in his pursuit. He approaches the mission to eliminate Melan with calm restraint rather than the intense, personal rage that consumes his partner, and he does not seek revenge for its own sake.

Pyon is the oldest and most mature of the Gun-Swordsmen and is regarded as the strongest among them. He adheres to a strict warrior's code similar to bushido, and this sense of honor shapes his actions throughout the story. Before Melan took the Creis and was branded a renegade, Pyon considered him a worthy partner and a deserving opponent. Afterward, Pyon concluded that Melan had disgraced the Gun-Swordsmen and that he should answer for his betrayal. Even so, his idea of justice is not limited to killing. When Erin attempts to kill Melan during a confrontation on Brigadoon, Pyon asks her to spare him so that Melan can be put on trial and his fate properly determined, but Erin is too blinded by fury to accept this proposal.

In the story, Pyon serves as a disciplined adversary whose purpose is to hunt down Melan alongside Erin. His opposition is rooted not in malice but in a sincere sense of duty and accountability, which makes him a more measured and principled threat than many other enemies. His most significant relationship is with Erin Garnet, to whom he acts as a steadier counterpart, while his connection to Melan shifts from mutual respect to a sense of betrayed trust that remains restrained and honorable. In combat, Pyon's skill is backed by his personal weapon, a bayonet sword revealed in a flashback to be named Excalibur. Visually, he is depicted as a male figure clad in armor, with red eyes and no visible hair.