Thinking about ways to build this crew up, both to help folks that want them to be recurring characters and those looking for ways to sell players on not just killing them off. Hoping to have something to post in about two weeks.
Currently on the plate are:
Non-hostile roleplaying hooks for each member that can play out in Wati.
Possible intra-group complications to play out within the necropolis
Possible post-showdown developments for each member
Possibilities for each member to serve as allies or rivals for the rest of the AP
Romance options for each member (even Kelthru and Velriana)
Member-specific adventure hooks for each member if allied
Admittedly it's probably best to wait until all of Mummy's Mask is out, but since folks are already playing... :)