Dr. Rabbit
I knew it was a spawn cape before I read the description!
It’s been 19 years now and i have fallen out of practice. I don’t draw dark, gritty stuff as much now, but i felt that the it would be good practice to once again draw capes in dynamic poses. A Great and Powerful Pony volunteered to be my model, and I think the new look suits her.
TL:DR short version: The Great, Magnificent, and Powerful Trixie in a Spawn inspired look.