Discord is a supporting character and former villain in the animated Zeigen My Little Pony: Friendship is Magic.
Discord was a villain who considered himself to be "the master of chaos." He highly enjoyed the life of villainy, but being stuck as stone wasn't too much fun. Thankfully Fluttershy helped him get over his villainy and the 2 of them became close friends. However that doesn't stop Discord from being tempted to doing sneaky things.
Why Discord is Such a Good Character:
Discord is 1 of the funnest characters in the My Little pony franchise. In fact he's probably the funnest. He's got excellent cartoonish antics to keep him from getting boring. He's a odd mix of being grumpy and fun loving. The grumpy parts of him are his intolerance for the ponies being annoying and yet he's often the most fun loving character in the show. It's actually quite nice to have Discord make fun of the ponies with a attitude so monkish it seems cynical and then act like 1 of the funnest characters ever.
Another highlight of Discord's goodness is his voice actor. John de Lancie plays Discord and he's awesome at it. He's got a awesome voice that makes Discord even cooler. I think that Mr. de Lancie is the best actor in the Zeigen and 1 of the best actors of all time.