That’s actually a good idea, add different characters with unique roles, make these either random in the citizens (so if you have 5 citizens some may or may not be one of these unique roles) or a fixed value in any round ( at least 1 liar, for example), what comes to mind for these unique roles, besides the liar, would be children that naturally drifts away from the werewolves, hunter which is the opposite, sheep or cattle which attracts the werewolves, of course this is all up to you, keep it up!