We always had the rule that you lose your position after not voting in two consecutive Council Sessions. So that should take care of the first two. Whether this means just parking the avatars somewhere or getting rid of them entirely is up to the GM, I think.

Prince Henri of course is another matter. It would take a long time for those two Councils to pass. Has anyone PMed mini yet? Also, are there any players willing to take Henri? It would be a shame if a member of the Imperial family was left playerless.