Evil Coco was planned to appear in the game Crash Twinsanity, an evil counterpart of Coco Bandicoot from an alternate dimension, but was scrapped along with a lot of the game's planned content. While Coco is sweet and kindhearted, Evil Coco is pretty much the exact opposite.

In that game she was to sound more seductive, which can be heard here: https://www.youtube.com/watch?v=bL9hfFDNWlo
You can go for something among those lines if you wish, or what I had in mind, which is more aggressive and cold rather than seductive.