And there was another idea (generally for some kind of mafia) to create a pair that isn't urban, but rather maniacal. Not making them super-powerful, like 75% defense, not leaving any clues, and burning everything, but something simpler. And they would go around in pairs, killing people, and we could come up with some interesting features.
Maybe even make it a choice: one kills, and the other checks the status/role of the killed person. One kills, and the other protects the first (acts as a lookout). One kills, and the other erases the evidence.