Hey, did you know that in the Les Mis movie, Claquesous was played by Julian Bleach? (Doctor Who fans know him better as Davros.)
So the guy who’s been this guy
and this guy
and this guy
and Machiavelli
and this guy
was playing a cold, murderous, mysterious member of the criminal underworld who “no one was sure that he had a face, as he was never seen without his mask” ? That was a pretty pitch-perfect bit of casting, even if we barely saw it.