If you weren’t a slave, whipped, beaten and cowed to your liberation day(if, indeed, you had one-- You got killed, remember?) you probably lived a nomadic existence best described as desperate.
With virtually no fresh water available across the sandy hellscape, hostile wildlife capable of killing you very quickly(and very painfully at that) and your supplies constantly having to be foraged and scrounged for(or, depending on your group, stolen), you probably went a lot of nights without eating. Or drinking.
Your cast-off neighbors from Zandalar, including madmen, hardened serial killers, depressed Trolls or Akunda The (Write-In Here) are a hit-and-miss case of trust. Most of the time, you are hiding from the people you can’t trust and just making sure you have the supplies you need to stay alive another day.
All of this said, there’s a surprisingly strong case for Vulpera being gritty survivalists, but being culturally predisposed towards being kind and courteous as a matter of desert hospitality. We never meet any Vulpera who are hostile to us, but we see plenty of examples throughout the story that crossing Vulpera can be a fatal mistake.
As a Deathknight, you are driven by a constant hunger to inflict pain. On a good day, it’s really not that bad because there’s not a lacking of ways to hurt bad people. On a bad day, it is wracking and difficult to control without you being on or right next to a battlefield or other place of fighting to quickly scratch the itch. It is a pain described by Thassarian, if I remember correctly, as being unbearable and maddening. Don’t quote me, haven’t read that in a while. The point I’m getting to is,
Recently it was confirmed that as a Vulpera Deathknight, you were not trained to deal with this all-consuming anguish you get when you aren’t hurting people. The easiest way to sate it is to inflict pain indiscriminately, but that’s also the easiest way to get dogpiled by 25 Orgrimmar Grunts. Your character is sick with a disease they may or may not have figured out how to deal with.
Further, you died, probably violently. You might have family left, you might not. You might be all alone in the world, or you might be clinging to the last shreds of your mortality as a way of staying sane, as Thassarian does.
I’m rambling because I’m brain-dead, but I guess my advice is to ask yourself questions about the life your Vulpera lived and the death that they died. What does that death mean to them? Do they have family this affects? Did they have strong opinions of the Cursed Dead(there are certainly no shortage) in Vol’dun before reanimation? What kind of person were they before they were killed and how has the mental stress of reanimation affected them? How are they coping with a desire to inflict pain? Were they sadistic before they died, and now that they are by default, how is their mind holding up?
Do they realize, yet, that they’re a monster? Or are they in denial of their nature? Vulpera aren’t that fleshed out as a people, but they have, in my opinion, a surprisingly nice set of character development questions. I hope you have a good time with your character and many memorable stories to share!