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Death Glare: Gives a pretty epic one to Aramis after the King announces the Queen is pregnant. Considering that Aramis and Anne had slept together in the previous episode, all signs point to him being the father of the child.
Chivalrous Pervert: He is always polite and respectful towards the women he pursues, never taking advantage of them, and he proves to genuinely love several of them including the Queen.
Comtesse De Larroque: You are a contradiction Monsieur Aramis, a soldier who preaches love and a famous libertine who cherishes women.
Dance Battler: He definitely remains stylish and graceful in battle.
Dual Wielding: Often uses a sword with a pistol and occasionally a musketoon (a smaller musket).
And a particularly cool instance during a Musketeers vs Red Guards fight at the end of The Challenge episode where he takes an opponent's rapier (flipping it up from the ground with his foot) and proceeds to wield it with his left hand, still using his own rapier with his right.
Freudian Trio: Of the Original three he is the Ego. Opposed to his book counterpart who is the Superego.
Friendly Sniper: The best shot of the group, and a cheerful sociable person.
The Heart: The one most concerned with keeping everyone together and caring for their well being.
Latin Lover: Although the character's ancestry has not been outright stated (so far), he does appear to speak fluent Spanish and is played by an actor of Chilean descent. And he's a Casanova that likes to describe himself as "the romantic hero type".
If Spanish ancestry for the character does get confirmed, he'd also qualify as a Dashing Hispanic.
The Medic: Usually the one sewing up the others and they also turn to his expertise when Cardinal Richelieu is poisoned.
Adaptational Villainy: To a degree. In the book, Richelieu was for the most part a Worthy Opponent for the musketeers, at times bordering on Friendly Enemy. Here, the cardinal has his mistress murdered for disloyalty in the very first episode to establish his ruthlessness, in the mid-season generally seems to be on the side of stable government, sometimes collaborating with the main characters, and in the final episodes, well and truly Jumps Off The Slippery Slope by trying to have the Queen killed for not being fertile enough.
Dirty Old Cardinal: Richelieu, despite being a high-ranking man of the cloth, has absolutely no qualms about his desire for beautiful women.
Evil Chancellor: Richelieu, the Prime Minister. Somewhat of an Anti-Villain since he believes he's acting for the good of France, and he doesn't seek the throne for himself (unlike some adaptations). But he is bent on controlling it, and will coldly mete out death to further his ends.
Lethal Chef: In "Knight Takes Queen", Queen Anne attempts to be helpful to her rescuers by cooking some fish. She thoroughly burns them. The musketeers are too chivalrous to make a mention of it, forcing themselves to eat their respective portions and making up an excuse when she offers them more. To be fair, it was her first time cooking, ever.
Action Girl: Somewhat, following D'Artagnan's lessons she's able to successfully disarm a baddie in a sword fight (while admittedly being shaky and have several close calls). However she is still easily defeated by true Action Girl, Milady De Winter.
Defiant Captive: In the finale she refuses to let being captured to break her spirit. She would've escaped on her own too if Milady hadn't stopped her.
Fake-Out Make-Out: First meets D'Artagnan when he attempts this with her to hide from pursuers.
Yandere: Implied with Milady towards Athos, especially in 1.07 when she takes an especial glee in destroying Ninon's reputation in court, and then going further to threaten all the women under Ninon's care with being burned at the stake unless she gives a false confession. And all because Ninon and Athos flirted with each other in her parlour!