So does Vayne represent the dark-side of Demacia?
So Vayne's lore was pretty interesting in her old lore she seemed to skirt the line between hero and anti-hero but here it seems she's deep in the anti-hero or probably villain category. That's not a bad thing, I think it's a good change to show Demacia isn't always the heroes.
In her new lore she hunts magic wielding people and monsters for sport and apparently torments them, kills her only friend and mother figure without any hesitation immediately after Frey tried to save her life because she used magic to do so.
Kind of reminds me of Miss Fortune's new lore except Miss Fortune despite having her family killed by Gangplank and growing pure hate for him afterwards and plunging her entire city into a civil war to kill him, she still seems to know who her friends are and who isn't, even tries to make new friends like with her and Lucian, and in the end seems to grow a genuine concern for the people of Bilgewater.