A shame to hear jean of arc has become controversial, but aside from her theres still plenty of famous french people to use for exclusives!
Somehow french kings seemed to be jerks though. One betraying jean of arc and causing her to be burned to death, and another betraying the templars and causing their grandmaster to suffer the same fate. I'd gues the monarchy had that revolution coming for many years.

Aside from Charlemange though, who would be an obvious figure to portray with playmobil considering that hes tied to both germany and france.
Bertrand du Guesclin would make for a good knight to portray with playmobil, seems he did quite a bit more for france in their battle against the english than Jean of Arc did but it probably seems less interesting in comparison. Then again, any french looking knight could be called Bertrand since theres no specific look to him.
Something they really SHOULD do as a french exclusive however, is a three musketeers set! Sure, they did musketeers before but not the real deal. Just generic musketeers of the era. I'd like to see them create a set featuring the three most popular musketeers. Or four if they wish to include D' artagnan.