The vampire ruler of an area, most likely a city in modern times. Their real influence and power may vary greatly from "god on Earth" kind (as Mikail or Mithra, but most others truly ancient vampires are more careful and hide instead... those 2 examples were both drained after all) to just a middle level pawn in power just as a face for someone else.
In this game is not yet clear what exactly the influence of other things like the "clans" (the bloodlines of the vampires) are and if stuff like very wide powergroups even above clans
exist at all. If those wider groups don't exist, then the authority of Princeps on average could be higher, enough to make or change more laws inside their domain instead than enforcing those decided by those other groups.
In this game anyway it's clear enough that Callisto aka "mommy" is way stronger than the Princeps. Anyway we really don't know much yet, the MC apparently is terrible at politics and power games (beside being dumb in general) and we see stuff through him after all.
The game only give points on SharonSavLaurie. I wonder why is there no SharonLove point? Why cant we romance with Sharon?
It's more like why can't we choose not to or how to?
I think that romance with Sharon is part of the main story until she dies or we reach some main plot point where we will decide which path we are going to follow from there.