I'm still kind've curious if they classify as void skins. They appear to be the opposites (and enemies) of Celestials. And thresh mentions a 'hunger' in his recall, and has a constant theme of consumption. I feel like Dark Star Thresh could be a higher version of a voidborn. But then again, it could just be a celestial themed skin with more dark motives.
ClockHead2 votes[deleted]
Horidas1 votesThe Void is also an enemy to Targon. The void is also known to have a rather celestial presence too, across universes. And it doesn't seem to be MUCH of a black hole as it is a sucking rift. I'm just theorizing this because of the purple outline, as true black holes have a colorless border.
GreenLore1 votesNah I think that if the dark star line was void related then thresh would mention that in his voice over.
I'd guess he would be more like one of 
siblings