So I guess Aradia killed Vriska then? That's pretty brutal.
That hasn't been conclusively proven! Aradia gave Vriska a beating, and six hundred hours later, she was dead. Actually, I think that by this point, they've all died, except for Sollux, who has died twice. That doesn't mean Aradia hunted them down one by one. Actually, you can't even prove she attacked Vriska in this timeline. Except for one, the robot swarm comes from doomed alternate timelines, which would mean that either the "Make her pay"-timeline was one of those, or the last thing Aradia did before taking out the Black King was beat Vriska up.
Okay, now I can't shake the mental image of Aradia killing the other trolls for no reason just to create more dead-end timelines.
As for Aradia being a slave of her own temporal machinations, yeah, I think Kanaya had the right idea about that. Karkat thinks that Glb'golyb was prototyped because of the curse he brought on the trolls, due to his tendency to perceive events as inherently negative and against him. Aradia thinks it was always inevitable because of Skaian machinations, due to her perception of the future as inevitable. Vriska probably suspects some kind of conspiracy. And Gamzee thinks it's a miracle. Aradia could change the future, but doesn't even try, because she
views the future as immutable.
Your future self has already decided what you are about to do. Now realise that this is true without time shenanigans, and I'll watch the fireworks.
But without time shenanigans, my future self does not exist in any meaningful way.
I will have decided what I was going to do in the future, but I haven't decided it YET. I have now decided what I was going to do in the past, but in the past I could still have changed these choices.
Also,
I came to a revelation today on why Vriska doesn't piss me the hell off anymore. I don't see her on the same side as the 'good guys' anymore, she has become a villain character. And as such I can appreciate how likable she is in how despicable she is. But I WILL get pissy if she is compared to the other 'kids' on the same level of 'good guys.'
So yeah, whoo Vriska.
She seems to have stopped killing and crippling her friends for now, and is working together with them to defeat the Black King and later troll the humans. I don't see why you would view her as a villain. She's definitely a protagonist.
Just pointing this out to annoy you.