Charleville appears early in the narrative with wavy golden blond hair, often styled with a loose, longer section cascading over his right shoulder. His dark green eyes and fair skin pair with a soft, kind smile or flirtatious expressions.

As an anthropomorphized embodiment of the historical Charleville musket, his origins trace to 18th-century France, where this firearm became standardized for military deployment. He connects to conflicts like the Seven Years' War, American Revolutionary War, and Napoleonic Wars, reflecting the musket’s evolution through weight reductions and structural reinforcements.

Personality-wise, Charleville favors strategic battles with assured victory, stating he engages only in winnable conflicts to remain alongside Master. Outside combat, he savors sweets and dedicates time to polishing firearms, openly inviting Master to share confections.

He operates in the starting team with Brown Bess, participating in coordinated strikes where all members focus on one target before advancing. During critical phases, he activates an awakened state with teammates to unleash comprehensive assaults on multiple opponents, channeling energy from accumulated roses for specialized attacks.

His central relationship revolves around unwavering loyalty to Master, expressed through declarations of fighting solely to stay by Master’s side and accepting sweets invitations.

Historically, the Charleville musket was smaller than the British Brown Bess but matched its battlefield effectiveness, undergoing technical refinements throughout its service.