It’s kinda funny really. When I first got into MLP, the first ponies I knew of were Princess Celestia and Princess Luna, and both looked like such beautiful princesses and the best sisters ever.
And Luna... she looked so amazing, I thought she was the nicest, silliest and sweetest pony ever and that’s all I ever thought she was. But then, I went back to the beginning of the show and saw this “Nightmare Moon” character, and of course I knew she was evil and I was just waiting for Celestia or Luna to take her out.
And then I got to the end of the episode and it revealed that Nightmare Moon was... Luna?! I was taken by surprise at first, because I knew that there was no way a pony as amazing and kind as Luna would EVER do something like this.
But I read deeper into the story and saw that Luna had been imprisoned on the moon for 1000 years by Celestia because Luna was so angered at being in her sister’s shadow, thinking that she was simply forgotten and ignored and that nopony appreciated the beautiful nights she made because they were always asleep during them.
Nightmare Moon was a creature born out of misguided hatred and jealousy of Celestia. The Princess Luna that I know... would never do this, because she knows that her and Celestia are sisters and always will be, no matter what happens!
I wish Nightmare Moon never existed because I know Luna is better than this. She not some creature of darkness that everypony should fear like a monster in the closet, she is a beautiful princess that guards ponies dreams and brings forth the night that everypony DOES appreciate!
She is Princess Luna and nothing else.