Unlike others I don't see Princess Celestia as being a tyrant or a bully. The Trollestia and Molestia stuff annoys the crap out of me. Celestia just has a lot on her plate and for being an immortal god pony whose dealt with who knows what for who knows how long, I think she handles things well. I'd be in a mental institution if I was her - especially after I had to banish my own sister. But I like Luna more for a reason that I don't even know. Luna's character is just cool and Nightmare Moon was totally awesome. As being a 28 year old guy, liking My Little Pony tends to get unwanted attention. But I only started watching the show because I went online and ended up watching Twilight and the others fight Nightmare Moon, although I had not planned on doing so. After that, the show and Princess Luna's character became a huge fascination and not many people around me get that. But even though I think Princess Luna is really cool, my favorite pony and to me "the most coolest" is Rainbow Dash. Sure she can be a hothead but Rainbow is totally awesome.
I love your wallpaper and I hope you continue using your talents. My Little Pony was of course originally intended for little girls but has gotten a very large male-based fan club over the past few years and I'm one of them. If you look at my Avatar you can also tell that I'm a Dragonball Z fan. I don't know if you like "that" show or not but to me it's the best anime show ever.