D’Artagnan – The central character of the novel, d’Artagnan is a young, impoverished Gascon nobleman who comes to make his fortune in Paris. He is brave, noble, ambitious, crafty, and intelligent. Like any Romantic hero, he is driven by love and ruled by chivalry, but occasionally prone to fall into amoral behavior.
Athos – The most important of the Three Musketeers, Athos is something of a father figure to d’Artagnan. He is older than his comrades, although still a young man. Athos is distinguished in every way–intellect, appearance, bravery, swordsmanship–yet he is tortured by a deep melancholy, the source of which no one knows.
Aramis – A young Musketeer, one of the great Three. Aramis is a handsome young man, quiet and somewhat foppish. He constantly protests that he is only temporarily in the Musketeers, and that any day now he will return to the Church to pursue his true calling. Aramis has a mysterious mistress, Madame de Chevreuse, a high noblewoman, whose existence and identity he tries to keep from his friends.
Porthos – Porthos, the third of the Three Musketeers, is loud, brash, and self-important. He is extremely vain, and enjoys outfitting himself handsomely; but for all that, he is a valiant fighter and a courageous friend. His mistress is Madame Coquenard, the wife of a wealthy attorney.