Athos stands among the Three Musketeers, distinguished by immense physical strength and a large stature, frequently portrayed with the design of a Mastiff or Smooth-coated St. Bernard. His combat style leverages raw power to overwhelm adversaries, occasionally rendering his sword unnecessary. Personality-wise, he exhibits vanity, gluttony, and a possible reliance on alcohol, yet typically maintains an amiable disposition—unless provoked, such as by a spilled drink.

Within the Musketeers, he serves as the strongest member, earning widespread respect across Paris for his fighting prowess. He develops a close partnership with Dogtanian, engaging in missions to thwart Cardinal Richelieu’s plots, rescue Juliette, retrieve royal jewels, and secure peace between nations. His bonds with Porthos and Aramis reflect steadfast loyalty, embodying the creed "One for All and All for One".

A decade later in *The Return of Dogtanian*, Athos undergoes a marked transformation. His role diminishes into comic relief, emphasizing exaggerated clumsiness and slapstick routines alongside the bear Planchet. This portrayal contrasts sharply with his earlier identity as a formidable combatant, simplifying him into a "fat oaf" archetype. He temporarily rejoins the team to assist Queen Anne and investigate the impostor King Blancbec, though his participation lacks the depth of previous narratives.