I've got two Les misérables and one "Dernier jour d'un condamné" (really!) comic books.
For LM, it's one of these Classic Comics (nothing special...) and a Donald Duck comic called "The secret of the silver candlesticks", which, to my knowledge, has only been published in a few countries; among other Germany, Italy and Finland. Maybe more. It starts off with Scrooge hiding from a tax collector in Donald's house where the nephews are in a terribly mood, because the TV's broken and they wanted to watch the first part of "Les misérables" (ever since I'm trying to find out what adaptation they probably watched. I still guess it's 1985). Through the lamenting of Scrooge, they find out that Hugo based the story on one of Scrooge's ancestors, known in German as Jean Dagojean (which makes sense only if you know that Scrooge's first name in German is "Dagobert"). So they get Scrooge to tell the story instead. Of all the adaptations for children, I would consider this one the most funny of all, without becoming too stupid.
About the last one: A comic book writer called Stanislas Gros has made a comic book adaptation of "Last Day" a few years ago. It's mainly pretty good; hardly cuts any text and I quite like the drawing style, despite the fact that it's often very simple. It's let down by a couple of historical inaccuracies (the galleys, once again) which often show clearly that the writer knew little more about the subject (prisons, argot etc.) than what he read in the book. Plus, there are a few really weird pictures...
Dark sarcasm ought to be taught at schools!