Greetings, Belur! Welcome!Ok, I don't think it feasible for your character to be a Dark Jedi, as "back in the day, 4,000+ years ago" according to our timeline here it was the Dark Jedi themselves who wiped out the Sith.
If you want your character to STILL be a Dark Jedi, logic would place him as residing on another planet somewhere, not on one of the Sith worlds and he could not be half Sith. The Sith themselves were just returned to "now" and there wouldn't have been time enough for a Zebrak to marry a Sith and produce Belur! (Not to mention the rest of the galaxy doesn't know that the Sith are back yet!!)
If you want him to be half Sith, half Zebrak, then he can be (he was born 4,000+ years ago just ahead of when the Sith were overrun) and died with them at the hands of the Dark Jedi. Then when actions by Gray, Roan, etc. etc. brought back the civilization, he of course would be brought back as well.
Maybe he finds something left by the Dark Jedi and becomes curious about them, wanting to learn more. But he would have to leave Khar Delba and go off hunting for any remaining Dark Jedi to learn from them (this would be a FUTURE event).
Any more questions, just let me know.
~Graysith
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I ride the Stormcloud and the Night!