This is Dionne! The only previous time I drew her was as a throwaway doodle for some goofy Character Creation meme back in 2009. (It's still in my gallery here somewhere.) I liked her enough to salvage her off of the scrapheap today.
She is second-in-command of a tyrannical dinosaur regime called the Raptor’s Claw, led by the dreaded Baron Tyderius. I never really gave the story much thought, but I imagine it’s something like “The Terrible Thunder Lizards, except the characters are competent”.