Right. 25 People means 6 or so Mafia. Slightly more than that if they have no powers and the town does, less than that if the Mafia have some powers. zexen didn't seem to agree when I asked whether there was a lot of killing roles, so maybe one or two besides Mafia, or other powers that cause kills like Paranoid Gun Owner.
Given that these roles don't always have their abilities come into effect, I'm going to assume a few nights of 3 kills but mostly the usual two. If we lynch no Mafia, they will win after Night 6. The more we lynch the longer it should take. I think we have a comfortable margin for now so a test lynch could be acceptable (e.g. to determine whether a cop claim is true). Modkills due to non-participation could change the balance a bit.
Since WoW is co-mod he probably suggested some of his usual roles like the Mafia Doctor or Mafia Framer. Maybe an improved iteration of the Temptress that's less hard to get around. These roles are usually quite weak (when I've run the games) but do cause some confusion so we should notice such anomalies early!
And, per usual, I'm not a fan of No Lynch so plan to use my vote to get people posting. Or if an obvious candidate presents himself, which is admittedly rare.