I think we could use some one-liners for each role.
Each one-liner should have less than ten words, and describe the role in question.
Preferably they should be snappy or witty.
I'll start this off:
Mass murderer: Evil veteran on wheels.
Citizen: Just your average joe
Mason: Sad, religious, pacifist citizen
Mason Leader: 33°
Mayor: The one who saw it start
Doctor: Serial healer
Bodyguard: Saves lives other than his own
Escort: Steals your time
Bus Driver: Arsonist without lighter
Sheriff: Vigilante with clues
Investigator: Detective with lockpicks
Lookout: Watches people change
Detective: Notices patterns
Jailor: Kidnaps people and kills them when bored
Vigilante: Legal serial killer
Veteran: Mass Murderer with a curfew
Spy: Paranoid mafia's illusion
Coroner: That guy from "bones"
Godfather: Makes offers people can't refuse
Mafioso: Vigilante with ammo
Consort: Evil escort
Framer: Forging his own roads
Blackmailer: Lookout with a camera
Disguiser: Cosplayer
Consigliere: Mafia bureau of investigation
Janitor: y u piss on floor?!?
Serial Killer: Pissed off guy with many knives
Arsonist: Bus driver without bus.
Mass Murderer: Evil veteran on wheels.
Survivor: Because dying is too mainstream
Jester: Seeks the stories end
Amnesiac: Decadent scenes from a memory...
Executioner: Mislynching, for great justice!
Cultist: Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn.
Witch: Good at conTROLLING
If you have a better idea for a one-liner already in place, feel free to say it anyway, and it might just replace the one up here now.