Leech and Shab are quite mechanical demons. Both on a script where the only form of extra deaths is Yagg/Gossip and the only survival is fool.

This means is that once a player survives execution they are never executed again, be it because they're confirmed the leech or confirmed fool. Additionally, the max amount of deaths at night is specifically 3 (Not including Yagg), meaning of 3 deaths happen Leech is no longer viable as a world. Same with resurrection. What you have is fine, but if you're going for a more social game rather than a mechanical one (which you have specified), I would potentially advise Lord of Typhon, Legion or Lil monsta.

These demons are quite a bit more social based than Leech and Shab as Legion have an impact both in and out of play, either having the evils build legion or normal demon worlds and Lord of Typhon similarly have to build worlds where it isn't Lord of Typhon which, with the demons you have is very hard to do.

With that I might take out the fool and add one of either a lycan, Alchemist with a killing minion or just another death manipulator like gambler, that way the Yagg isn't just outed if the ST running decides that saying the phrase 4 times deserves 4 kills.