Console Wars Mafia 2015
Mafias: Microsoft and Sony (Sony gets 1 more mafia member than Microsoft, but Microsoft can hit first)
Ghost Mafia: Nintendo: If Nintendo (Godfather single player) kills the Godfather of Microsoft or Sony then it becomes the head of that mafia and the remaining mafia players become Nintendo
Townies: Fanbois
Roles: NWR Writer: Investigator
gamestop Employee: Vote changer
Console Collector: Doctor
PC Master Race Fanboi: Killer
There you go. Ready made theme, with 3 mafias.
EDIT:
Forgot Ghost Mafia Rule. Nintendo can make a hit everyday, but only succeeds if he targets a Godfather. Otherwise, the hit does not kill anyone. If Nintendo kills Godfather, then they become the new head and can perform normal hits.
Other Mafias rotate Day 1 Day 2 Day 1 Day 2 Hits.