The Special Roles
Three Wolves,
One Bear,
One Mytho,
One Cursed villager,
One Hunter,
One Ranger,
One Seer,
Total- 9
Now if we get a total of 15 players we'll have 6 ordinary villagers. 9 with 18. All these roles would be fun to play as in my opinion, of course if you plan to have Shiriffs as well then I daresay there will be too many special roles which would take away their specialness. (And make an innocent special

)
Of course if you want to cut down on special roles here are my suggestions-
Remove the Cursed Villager (Mytho will be more of a wild-card and will make things more interesting)
Subbing the rest would be hard so thats all I can come up with.
Of course
Darth Modka has the final word and I'll play by what she says.