I want to host a game with two evil teams - mafia and werewolves. And, of course, there would be town.
a) mafia: several guys. there are powerful individuals, with political and economical connections. They have their own dirty tricks (like roleblocking, influencing votes, etc.) but they cannot kill anyone directly
b) werewolves: there is lower number of them than mafia. They are beasts. They kill (one team kill per night). They have some strange abilities which I do not want to describe here, but lets consider them to be minor

Town (and mafia) would have some power roles, but no 'full scanner' (cop or someone similar). There is possibility of tracker/watcher, and of other kinds of power roles (vigilante, doiuble-voter, doctor, etc.)


One unusual thing: each 'day' (voting phase) will represent first day of a week - a day of religious celebrations, a day free from work. Each 'nihght' (action phase) will represent the rest of the week. t is mostly a flavour change, but I want to use it to introduce new mechanic: phases of the Moon. At new moon, werewolves are weak - they are more vulnerable, and they cannot attack. at full moon, werewolves are potent. they can use all they special abilities and they are almost indestructible. Game starts one week before full moon.

Another unusual thing: there would be no reveal at death. But, after two days, a coroner's raport would be published. hs raport would describe the case of a death, and if body has any anomalies, it would be described either. So, if killed person is a werewolf, it would become known after two days. But, there would not be any information about deceased person being mafia or not. Additionally, there will be roles (I think about 2) which would be able to give some info about deceased character. For example, person who can check if deceased has any criminal record (all mafia will have crilminal record, but some townies also).

This is short description of most of aspects of this game (some I do not want to reveal)

I have a question to you all:
Let us suppose, that there are 25 players. How many of them should be mafia? How many of them should be werewolves? Remember, mafia does not have ability to kill at night.