This is an obvious one. Excluding all vanilla roles from the game means everyone has an ability and this raises interest in the game. There are several options:
- Create/Include Uncommon Roles - If you make some weak roles, the town does not get overpowered by having no vanillas, yet still everyone has an ability. I have for example used this strategy in a game with the Roman Revolution as theme (link)
- Share Roles - By giving one guy uneven night investigations, and another even night investigations, you've got two people with abilities, yet their strength is under one (because they can double). This can be done for lot's of roles of course: Vigilante, Roleblocker, Doc etc.
- Turn Vanillas into Weak Roles - Instead of making someone a vanilla, you can make them Mason (weak in large games), Tracker, Double-Vote Townie (weak in large games) etc.
Again there are several ways of achieving this. You can have any vanilla be changed into something more interesting through triggering. For example, have someone play vanilla until their prospective Mason finds them. The Mason can send you one name per night to find out if that person is his buddy. In such ways you can of course make Activated Vigilante/Serial Killer/Roleblocker etc.
I really love including subgames in Mafia's, and will probably attempt to do so in any future game I make. There can be various kinds of subgames, from very easy to pretty complex ones. There are also other distinctions that can be made: Is playing the subgame mandatory, automatic or by choice? Is the subgame directly or indirectly related to the game, or not at all?
Some examples:
- Automatic / Simple / Indirectly Related --- A game I played in was themed 'American Politics'. Apart from the Mafia/Town distinction, there were Republicans and Democrats mixed through both. The subgame winner was the group who had the most remaining alive at the end. So if there were more Democrats who stayed alive, they'd win. Everyone automatically plays (because everyone is either D or R), and the game is simple. It is indirectly related because it does not affect gameplay, at least not much.
- By Choice / Simple / Directly Related --- A game I am currently playing in is an Anime All Star Mafia. The moderator gives out hints after Night messages and anyone who solves the damn thing gets to ask a question about the game to the moderator. Playing is by choice (I haven't really looked at it), the subgame is simple (even though the question can be hard) and it is directly related.
- By Choice / Simple / Directly Related --- Another such subgame was to find the solution to something in a Haruhi Suzumiya themed Mafia (an anime series). Every player had received a hint in their PM, it turned out that all the hints were sentences from the Prologue, and the missing one was the first sentence. Instead of getting to ask a question, the first to solve it got some actual role-benefit out of it (iirc). (For example getting to Roleblock someone once or something like that).
- By Choice / Complex / Unrelated --- I am myself working on a Mafia themed 'The Hobbit' and will play it in a month or so on utopiatemple.com. The book 'The Hobbit' contains a large number of Dwarves which hardly have a role, yet are important somehow. I can't give all these guys actual abilities, so I decided to make a subgame. The game is a 'treasure hunt' and gives out points for puzzles (crosswords, mazes, riddles) solved. It is unrelated to the mafia.
- Automatic / Complex / Indirectly Related --- A sort of award for whomever is the best player. It is complex because it can be involved in all the aspects of the original mafia game (which is complex), does not influence the game itself (does indirectly related) and playing is automatic. You can for example give out points for voting for scum, investigating/killing scum (for cop/vigilante), activity in posts etc. Of course this all is revealed at the end of the game.
To increase discussion and involvement in the discussion you can give every player a hint about the game mechanics and set up. I am doing this in a minimafia game with as a theme the regal period of Rome. (Rome was ruled by 7 kings before it got changed into a republic). There are some vanillas in the game, but they each have a unique hint about how the game is set up. Examples:
- There is one Serial Killer in the game
- Everyone has received a hint
- Godfathers do not have investigation immunity in this game
- There is one Paranoid Cop in the game
- There is no Vigilante