Will admit I did not see the whole "emotionless = evil Aya" thing coming. My idea was evil Aya comes about from anti monitor turned herald. Pretty much the same, but anti monitor still with a head. Lol
I don't think she's necessarily being evil, but certainly is confused, hurt and doesn't know how to handle herself. She's working out of pure logic with no regard for humanity. Morality... skewed. S'the problem when you take a highly intelligent being with very little life experience and expect them to act and function as a normal adult in a crisis.