I don't know if this is any good, but I've been toying with the idea for a while, and I figured, why not share it.
Chart A:
Town Jailkeeper | Vanilla Townie | Mafia Goon |
Mafia Roleblocker | Town Cop | Town Doctor |
Town 1-shot Bulletproof | Mafia Goon | Town Tracker |
Chart B:
Town Wizard | Vanilla Townie | Werewolf Goon |
Werewolf Roleblocker | Town Seer | Town Guardian |
Town 1-shot Elder | Werewolf Goon | Town Stalker |
Choose one row or column at random from each chart, and add:
1 Mafia Goon
1 Werewolf Goon
5 Vanilla Townies
for a 13-player 9:2:2 setup.