I'm reading Zwillingsturme, and while I'm only on ZT-2, something that really struck me about Arturia Giallo is that... well, she hardly seems as 'evil' as she's made out to be? by both the fandom and the Lateran state. Like I said, I'm early on and may have to revise this opinion, but still.
It's indisputable that her Arts, combined with her sort of persuasion, have led people to their deaths, but in the cases of both Kriede and Bordin... She helped give them meaning and find purpose, despite their tragic ends. Bordin is able to, one final time, stand up as a hero and save a single life in front of him, and Kriede, while doomed, is able to refute the claim that he and Ebenholz' lives were tragic, and that part of Kriede's mentality is largely thanks to both his mentors, Arturia and later Czerny.
Through her actions and words, not even mainly her Arts, Arturia is able to grant both Kriede and Bordin the chance to die with their heads held high, facing their fates.
And even with Frau Seemann at the beginning of the event, she is... accompanied by Arturia, to put her whole self into her painting, a painting that, in my opinion, seemed to express more 'love' for the Witch King than condemnation of him, despite what the public thinks. It's with Arturia's help, because it is genuinely helping her recognize and express her feelings, that Seemann is able to put her whole 'self' and soul into her art... which is also just what an artist does, or at least what many might aspire to do.
I mean yeah, she still gives off sinister vibes at first glance, especially when you look at the background of her E2, and if you read about the powers of her Arts, they could be potentially very destructive if she had the mind to turn them to that purpose, but that's not really where her personality is, and she even says in her File that the reason why she doesn't play while at RI is because RI is basically making beautiful music on it's own and shouldn't be interrupted by her.
"She believes that truth freely, fully expressed, leads to a life without regret."
And she's fucking right, damn, to thine own self be true.