Information:
Full Name: Princess Luna
Nicknames: Woona, Lulu, Mama, Mummy, Mum
Gender: Female
Age: Over 1111
Species: Pony (Alicorn)
Husband: Supernova
Children: Princess Lunar Comet (Daughter), Prince Nebula (Son)
Place Of Residence: Castle of the Two Sisters (Formerly), Silver Shoals (Formerly), Canterlot
Personality: Intelligent, Wise, Strict
Parents: Queen Galaxia (Mum), King Cosmos (Dad)
Cutie Mark: Moon
Occupation: Ruler Of Equestria (Formerly)
Bio:
When Luna was a young filly, she always wanted to be a princess with Celestia and when she was older, her dreams finally came true and Luna was crowned 'Princess Of Equestria' with Celestia by her side.
A few years later, Starswirl and 5 other unicorns lost their powers to raise the sun and moon so Celestia and Luna had to step up and do it instead and then they successfully got their Cutie Marks.
About 111 years later, Luna had to get banished to the Moon for 1000 years for refusing to lower the moon to make way for the dawn. After 1000 years, Luna reunited with her older sister thanks to Twilight and her friends.
About 9 years later, Luna retired and gave Twilight the job of being Ruler Of Equestria. During her time in Retirement, Luna met with Supernova and they got married together and they both had their first child, Princess Lunar Comet.
1-2 years later, they had their second child, Prince Nebula.
When Twilight had her first child, Luna visited Canterlot with Celestia to congratulate her. But when Twilight had her second child, Luna was too busy to visit becasue of her child but she sent Twilight a letter instead.
When Twilight got assassinated when her children were teenagers, Luna was deeply saddened by the news and had to take her place back of being Ruler Of Equestria with Celestia again until it was a good enough time for Celestia's oldest child to rule instead.
Luna didn't mind being called a Princess and Celestia being a Queen because she has children now and she won't get jealous anymore.