Well, Charles-Jeanne wasn't mentioned by name in the Brick, so I think I'm going to go with... Jean-Jacques Staub! He was a German emigre whose ability to also speak French was super helpful in dealing with his Parisian clientele. (Kind of like coming to France on an internship, except forever.) He was a very stubborn individual both in real life and in terms of his literary counterpart, going as far as to track his clients down at their personal addresses to demand payment for wares purchased on outstanding credit. Germany during this time period was absolutely rife with political unrest, starting with the collapse of the Holy Roman Empire at the beginning of the century. Staub likely emigrated to France to escape the frustrating political situation, seeking out the (at this time) more enlightened France.
He was definitely a friend of the republic, providing all those fancy waistcoats, crucial for political rallies and viewings of Hernani. Probably also Enjolras' hussar vest. One could argue he was the leader of Parisian fashion at the time.
"Quand vous aurez besoin de Bahorel, capitaine, Bahorel est là! Je sais faire trébucher tous les chevaux du garde-corps avec une ficelle... Rien qu'une petite ficelle. Enfin, pensez à Bahorel du Café Musain!"