I kinda feel if Twilight Sparkle were to be corrupted by the same influence that turned Princess Luna into Nightmare Moon, this would partly be how she would turn out. Just not standing on her hind legs and no scythe. Still really awesome work, can't wait to see more.
This reminds be of Soul Eater. Spike would be Soul, and Twilight would be Mocca. Rainbow Dash would be Black Star, and Fluttershy would be Tsuboky (If I spelled it right). And Rarity would be Death the Kid, while the twins would be Flim and Flam. Dang, if someone would make a poster for that, give me a call!