Princess Luna is Princess Celestia's younger sister who serves as co-ruler of Equestria and uses her magic to raise the moon and safeguards her subjects' dreams during nighttime.
Princess Celestia born as the second child of King Cosmos and Queen Galaxia of Equestria. When she was a filly, she used to play a lot with her two sisters, Ingrid and Luna. In "The Innocence of Youth", Celestia and her family welcome a new member, Orion. She and her sisters also reaffirms their eternal friendship.
Lauren Faust, the show's creator, stated that Celestia does not have parents that outrank her, that Luna and Celestia have no siblings and no children, and that Blueblood is "the great great great great great great great great great great great (and probably even more greats) nephew on Celestia's and Luna's mother's ...
Princess Luna is the younger sister of Princess Celestia who, one thousand years before the events of My Little Pony Friendship is Magic, was consumed by jealousy, turning her into Nightmare Moon. She attempted to cover Equestria in everlasting night, forcing Celestia to seal her away into the moon.
Princess Celestia is the benevolent ruler over all of Equestria! She and her younger sister Princess Luna are responsible for raising the sun and the moon to create light and darkness in Equestria. As a wise and magical teacher, Princess Celestia has entrusted great responsibility to her best student: Twilight Sparkle.
Queen Galaxia, along with her husband King Cosmos, used to rule Equestria before their daughters. They used to raise the Sun and the Moon, being her the one to raise the day.
Izzy is Luna's Daughter
Long ago in an Equestria not quite like the one Izzy currently inhabits, there was a socially awkward moon princess who was super lonely... again Like, to the point of desperation. This went on for around 50 or so years until an industrious pony software engineer invented the first dating app.
Princess Skyla (Full name Skyla Heart Sparkle) is Princess Cadance and Shining Armor's first born foal. Skyla is the older sister of Princess Armor Bride, Princess Sweetie Heart, Princess Scander and Princess Britney Sweet, Flurry Heart and Prince Tyrone.
Celena eventually had a daughter named Estrella and passed the Royal Magic Wand on to her. In the series, Celena is depicted in tapestry in the Butterfly Castle's "Grandma Room" in "Into the Wand", "Conquer", and "Ghost of Butterfly Castle".
She is currently in a war with King Sombra, her former husband with whom she has a daughter called Twilight Sparkle who she sent away in order to protect her from Sombra.
Kyouko and Celestia are often shown by the fans as having a crush on each other, as seen from the story. Part of the reason why they're shipped together is that both are mysterious and stoic girls.
Celestia Ludenberg, also known as Celeste, whose real name is actually Taeko Yasuhiro, was a participant of Killing School Life in Danganronpa: Trigger Happy Havoc, as well as its anime adaptation, Danganronpa: The Animation.
Sweetie Belle is one of the secondary characters of My Little Pony: Generation 3 and My Little Pony: Friendship is Magic. She is Rarity's younger sister and is a member of the Cutie Mark Crusaders along with her friends Apple Bloom and Scootaloo.
One thousand years prior to the series setting, Luna became jealous of Celestia when the ponies shunned her nights but enjoyed the day. She eventually transformed into the evil wicked mare of Darkness and Destruction, known as Nightmare Moon as a result of this jealousy, and was imprisoned in the moon.
According to Lord Tirek in The Beginning of the End - Part 1, the land that would eventually become Equestria was originally a collection of farms and pastures until Grogar declared himself emperor of everything.
Celestia and Luna have it because it takes massive amounts of power to raise the sun and moon. Cadence did get a flowy mane once, in the last scene of A Canterlot Wedding (when she and Shining Armor banish all the changelings). It's only for a second, and shining armor has it too.
Moon Butterfly, also known as Moon the Undaunted, is the 36th Queen of the Kingdom of Mewni, ruling alongside her husband River Butterfly, and the mother of Star Butterfly.
Nightmare Moon
Celestia then reluctantly harnessed the power of the Elements of Harmony and banished her to the moon, taking responsibility for both sun and moon and maintaining harmony in Equestria.
A flashback in "Pizza Party" shows that Eclipsa shared her love of Snookers bars with her mother, Solaria.
In The Beginning of the End - Part 1, Flurry Heart is abducted along with her parents by King Sombra when he invades the Crystal Empire, but she is rescued when the Mane Six defeat him with the Elements of Harmony.
Despite this, Pipp is very charismatic and compassionate, cherishing the love and support of her followers, and she has a strong relationship with her mother Queen Haven.
Those word were taken as an indication that not even Celestia and Luna were born as alicorn but instead turned into alicorn afterwards. This would make Flurry Heart the first "natural" alicorn in the series.
Prince Blueblood is a royal male unicorn pony who resides in Canterlot. He is the distant nephew of Princess Celestia and Princess Luna and the cousin of Princess Cadance.
Izzy Moonbow
Izzy is an energetic unicorn who loves crafting, creating, and sparkles.