I personally have never seen this version, I only saw the Man in the Iron Mask with Leonardo DiCaprio, so all the credit goes to Silverwolf for this Prompt.
Nathanial leaves his home in the French countryside to join the king's Musketeers like his father did only to learn they have been disbanded by the evil cardinal Hawkmoth and his right hand man Theo Barbot an ex Musketeer, but soon finds himself in the company of three Musketeers who rebel against Hawkmoth's tyranny, with his new friends Nathanial sets out to save the king, win the heart of the Queen's lady in waiting Juleka, avenge his father and learn the true meaning of the Musketeer's: All for one and one for all
Whose Who:
Nathanial as D'Artagnan
Kim as Athos
Nino as Porthos
Ivan as Aramis
Theo/Copycat as Captain Rochefort
Hawkmoth as Cardinal Richelieu
Chloe as Milady De Winter
Adrien as King Louis
Marinette as Queen Anne
Juleka as Constance
Silverwolf NOTE: I used Nathanial more similar to D'Artagnan then Adrian and I wanted to focus on one of the less main pairings in the fandom than Marinette and Adrien in this story and I always preferred Nathanial with Juleka than Chloe, Lila or Marinette so I hope you consider it