Hmm, Interesting though I'd prefer it if Discord turned good completely of his own volition as opposed to being subtly brainwashed into being a model citizen but maybe I'm just being overly idealistic.
(And dangit I need to learn to proofread my comments better. I forgot to delete the "don't" in my second sentence. It's what I get for trying to juggle three tabs at once.)
I think Discord is the only character who attains the stature of Celestia
Celestia- You said you were going to use your power for good and not evil...
Discord- ...Most...of the time.
Wonderful work! Perfect vector!