She was honest.
She never told a lie, and was known to never keep secrets if it was important to her subjects.
"Luna, you know I would never lie to you. You know I wouldn't hide it if I really was! Trust me." she whispered.
"I can't believe that until I prove it." A flash of light, and the both nearly fell. When it faded, nothing was changed.
"I told the truth, dear sister." This made Luna smile...
She was loyal.
She wouldn't give up her land or her subjects for anything, anything at all.
"No means NO. I said no, and I would like you to leave me alone with the matter now."
"Oh, you know you want my offer. You'd love to accept it. How about for enslaving all the ponies in Equestria, as long as you just give me their love?" the raspy voice of none other than Queen Chrysalis bargained.
"I wouldn't give up my subjects for all the power in the universe." With that, the changeling queen was banished...
She was kind.
She didn't hurt any creature intentionally, not even those dark of heart.
"Discord. You have done a terrible deed trying to regain the power of Equestria for your own chaotic purposes."
"I regret nothing, but don't kill me." the once powerful spirit of chaos and disharmony now cowered before the stronger being.
"I wouldn't kill you or even hurt you. Just remember what you did, and never come back." she entrapped Discord in stone once more with a glow of her powerful magic...
She was funny.
She told jokes and pulled pranks just as any other pony would.
She took a sip of tea.
The baker rushed by and refilled the teacup.
She took another sip and the same thing happened.
The third time, she faked a sip and the baker attempted to fill it, only to make the tea dribble down the sides of the cup and onto the table. "Gotcha." she whispered, smiling...
She was generous.
She donated to needy ponies and helped those who needed it.
"Can you help me, Princess?" a moan drifted up from the alley behind her, causing her to turn in surprise to see a near-dead, filthy pony laying against a wall.
"Oh!" she ran to the pony, an earth pony stallion, and hefted him onto her back, carrying him back to the castle, which was a quick trip for Celestia, with her wings. There, she let him bathe, rest, and eat.
"Oh thank you, thank you. I am eternally grateful, your highness." he bowed.
"It was nothing, really..."
She was magic.
She honed the most powerful magic in all of Equestria, possibly in all of everywhere.
"Sister, I have lowered the moon." Luna sighed in exhaustion. "It is time."
With a glow of her horn, the sun raised to the sky...