Centipeetle

When she was drawing the pictures of the evacuation and the corruption of her and all the other Gems, you can hear her get more angry and bitter and grief-ridden. She and her crew had loyally served the Diamonds for centuries, maybe even longer, and this was what they got in return? Half-lives as horrible abominations that spent every waking moment in constant agony? It makes you happy when you remember that they're all restored now.

I can just hear her saying something like "The Diamonds...after all we did for them...how can they do this to us...why would they repay our selflessness...our obedience...our loyalty...like THIS?"