Fluttershy The Hideous New Girl
Zim thought he could enslave the Elements of Harmony to refit for the purposes of THE GLORIOUS IRKEN ARMADA.
He managed to capture Fluttershy.
Well not as much capture as "trick into eating a drugged cookie".
Turns out it's not so easy to reprogram mythological creatures blessed by magical artifacts either.
He managed to put her brain in the body of a school kid to use as an ally, but the reversal of the Element of Kindness caused her to be sadistic to anything breathing, including him.
He rationalized this to himself as being so good at his job he made her minion twice as destructive, as she attempted to shove him in a kebab machine.

In the same series: www.deviantart.com/cyanoray/ar…