Celestia VS Nightmare Moon

I really like the history behind Nightmare Moon and all that cost not just to Celestia but Luna herself.

For Princess Celestia, the difficult choice between not hurt her sister or fight against her for the sake of all her subjects is a very mature thing, for a cartoon that is supposed to be destined to little children.

And for Princess Luna, besides, to be turn into the incarnation of all nightmares and face a difficult redemption (and lessical changes) is, I think, what makes she so loved by a very large amount of the show's fan.

But, yet again, I'm just a "quaqquaraquà" who raves about two background characters of a cartoon... the fact is I really like doing this things.