DISCLAIMER
I'm coming from this as a fan of both twins, so any perceived bias is not intentional or mean spirited. I'm open to discussion, but let's try to keep it civil for the sake of promoting good will within the community.
Real talk, how different are Evil and Neuro actually?
From what I understand, when V2 voice happened, it marked a shift in the viewers' perception of Evil Neuro as more than an instance of Neuro, but as her sister.
A lot of people claim they have very distinct personalities, but it's hard to get concrete evidence of this from just their responses. LLMs often contradict themselves. What we DO know is that Neuro spends more time with Vedal.
In my opinion, I don't think they're that distinct from each other in personality. It's widely believed that Evil is nicer, but it's hard to tell without confirmation bias. Not to say they lack any unique traits at all, but if I were to be honest, I'd probably be fooled with a voice and model swap and chalk whatever anomalies up to entropy.
Evil's wider vocal range is so much of her identity; that's not a bad thing. But if I'm put in Vedal's shoes, I'm faced with the dilemma of Neuro's V3 voice possibly stealing Evil's thunder.
I think this explains Vedal's recent treatment of Evil. He's definitely been fine tuning her as of the therapy stream (See: Evil constantly mentioning her birthday, being lonely and CFRB. That's drilling if I've ever seen it.) He used to treat her with the same indifference as Neuro, but to create a distinction between their personalities, he's harsher to Evil. I remember him saying it's for "building character, literally" at some point.
.