The Ghost

 The Ghost is the first player in the game to die. The Moderator doesn't reveal the Ghost's old role to the other players. They remain awake during the night and cannot participate at all during the day. They can write notes on a pad or a whiteboard, to the survivors, one letter for each death. They cannot use the notes to spell names. They must use their off hand. There is a 5 second time limit for writing.

 Most importantly the Ghost doesn’t have to be on the Villager’s team. They might have been on the Werewolves team to begin with and they might be angry at the Villagers about being lynched after all.

Balance in games with the Ghost isn’t changed terribly. Most players won't trust the Ghost's messages and with the restrictions placed on them they aren't terribly clear to begin with. Games where the Ghost is working for the Villagers it still takes a lot of deaths before a real clue is given.

The Ghost Variations

 * The Ghost is given a new team affiliation at random by the Moderator.
 * The Ghost can only pass their notes to one player who is chosen at random by the Moderator.
 * The Ghost can only write one letter per night.