Workshop

Here is a rough draft:

Setting: Las Vegas.

Town:

Millionaire - 2 votes.
Status: good

Policeman - No action - checks statuses or protects against an attack.
Status: good

Doctor - No action - revives or deprives a character of their ability for the next night (malicious healing).
Status: good

Casino Owner - No action - blocks a character's ability (a blocked character cannot be killed). Turns an ordinary townsman, doctor, or policeman into a drunkard (loses previous abilities).
Status: bad

Drunkard - No action - observes a character. Does not have a home. Sees the killer of the observed victim.
Status: bad

Private Detective - No action - checks statuses, can hack the police database to find out the statuses of players checked by the policeman (once every two nights).
Status: good

Townsman - no special abilities
Status: good

Russian Mafia:

Boss - No action - kill.
Status: good

Gangster - No action - kill.
Status: bad

Corrupt Policeman - No action - kill or hack the police database (once every two nights, starting from the second night).
Status: bad

Triad:

Dragon Head (or Triad Boss) - has a 50% chance of avoiding death.
Status: good

Triad Member - No action - kill.
Status: bad

Raider - No action - blocks the Casino Owner (both remain unknown to each other) or kill (can block once every two nights, starting from the second night).
Status: bad

Comment:
I think the bosses need something added to their abilities, but I haven't decided what yet.

Added 1 minute ago
But in general, this is for 20 people...