@Background Pony
The only character confirmed dead besides AJ’s parents is the one at the funeral that Sweetie Belle crashed.
Edit: I should mention one of the showrunners, Theissen I think, said they would be staying away from dark and controversial subjects like death, war, etc. So much for that :/
Well…since I usually don’t consider word-of-god canon, I would put this in the “ambiguous” box. But in saying that, because of the ambiguity, I’ll tepidly accept that King Sombra is deader than disco.