Excuse me I just need to ask you. The Bird from A Bug's Life is reformed neutral, not as villain. Just because she left Flik and Atta alone facing Hopper as anti-hero, It doesn't mean she is a villain. Because it just a bird.
Reformed Neutral means change to good than neutral (not villain).
In the near end of A Bug's Life. The Bird feeds Hopper to her chicks as she become good, because she sees Flik was tricking Hopper into becoming bird food, but then she left Flik and Atta alone facing Hopper.
That says nothing about her alignment. She left Flik and Atta alone because she didn't see Atta, and she was too distracted by Hopper to acknowledge Flik. She was probably thinking "Hopper is the bigger insect, so my chicks will each get a bigger helping". So it was Hopper that she grabbed. That does not say anything about her alignment, and no that does not make her good.
I know the bird was redeem to anti-hero but she does not say, "I have learned that what I am doing is bad and have decided to stop doing that and change my life for the better." because she was silent antagonist and saying in her brain to reform but she's always neutral. Just because what happen in Peter Pan, Tick-Tock the Crocodile was an anti-hero (but always neutral) who eats Captain Hook from Peter Pan.