It actually begun as a simple game with one King, one Guard, one Spy and 4 townies.

But then I thought the townie side is overpowered, so I added the investigate ability to the spy.

Then I thought the spy was overpowered, and so added the detective and the doctor.

And then I thought the mafia side is too weak, so I added a sympathiser.

And then I added a blocker to balance it out...