i think the thing that really gets me about pre-canon durge is their absolute sense of duty, and their utter isolation outside of the cult of bhaal.
most of the cultists seem eager to see durge upon their return, and one even says they were the first to feed him flesh. gortash tells them of an exhibition of a bhaalspawn's corpse and another bhaalspawn's creations and durge immediately plans to attack the hall of wonder to recover them. they then apparently entrust said bhaalspawn's corpse to sceleritas fel to "restore" through taxidermy. they deride orin for her artistry with corpses explicitly because "bhaal will never care" and because orin "[does] not understand lord bhaal".
even their infamous prayer for forgiveness is framed around their absolute submission to bhaal's plans, and the crime that requires forgiveness? admiring his rival's chosen. that's one line, and the next three paragraphs are swearing to carry out his plan exactly as they've been told to, all for his forgiveness.
hell, even their room reinforces this. orin has barely touched the place aside from installing her mother's corpse and her manifesto - and that is some of the only decoration. what was it before orin, an empty room with skulls, a bed, a desk, some chests and a wardrobe?
the durge didn't have any semblance of a life outside of bhaal, aside from gortash. and is it any surprise? the only other hint they ever had a life outside of the cult is the flashback of kid durge murdering their adopted family, all thanks to their father's urging.
bhaal even tries to force them back into isolation after they've been tadpoled by forcing them to kill alfira, and then trying to force a durge who resists him to kill their lover. if they continue resisting, bhaal kills them. bhaal will not allow them to have a life outside of him and, if it weren't for jergal, he would've succeeded.
as we enter the start of a semester and the dreaded Hour of Making Friends us upon us... if ur ever at a loss for what to say in one of those weird social situations where you only vaguely-know people, one of my favorite questions to ask is "what is your favorite food crime." a food crime is like the food combination that you love that other people find revolting. press them to take it further than pineapple on pizza, that's rote. food crimes is a good topic that has many benefits as it turns out all people are degenerates and also it will give you some cool ideas to try out later in the privacy of your own degenerate kitchen
the other good thing to ask is "okay but has anyone here ever been someplace haunted" bc it turns out if you ask most people directly they don't believe in ghosts, but many people are like "oh yeah i lived in a haunted house. ghosts aren't real tho"