The fanfic could show their parents as travelers from a far - off land. They brought with them new kinds of magic that they passed on to their daughters. Maybe there was a family feud among the alicorns, and Celestia and Luna's parents had to make difficult choices to keep their family safe. This would add drama and intrigue to the story. It could also explore how Celestia and Luna's personalities were shaped by their parents' actions and decisions.
Perhaps their parents were part of a group of celestial beings. They had to leave Celestia and Luna at a young age to fulfill some important mission. Celestia and Luna then had to grow up quickly and learn to rule on their own. The fanfic could be about Celestia and Luna's journey to find their parents and the secrets they discover along the way. It could also show how their parents' absence affected their relationship with each other and with their subjects.
It could be that their parents were the ones who first discovered the magic of the sun and the moon. They taught Celestia and Luna how to control these celestial bodies. The fanfic might delve into the family's secrets, like hidden spells or ancient prophecies that only their family knew. It could also show the relationship between Celestia and Luna as sisters growing up under their parents' guidance.
One possible storyline could be Spike discovers a long - lost magic spell that is connected to Celestia's past. He embarks on a journey to find out more about it and ends up having to team up with Celestia. Along the way, they face various challenges and learn more about each other's strengths and weaknesses.
One possibility is that their parents were powerful celestial beings. They might have ruled over a vast and magical realm long before Celestia and Luna came into power. Their parents could have been responsible for creating the very fabric of the Equestrian world, with its unique magic and diverse landscapes.
A fanfic titled 'Luna's Redemption in Celestia's Eyes' is quite interesting. It focuses on Luna's journey towards redemption from Celestia's perspective. It shows how Celestia has always believed in Luna, even during her darkest times. The story is filled with emotional moments that really tug at the heartstrings.
Some fanfics might explore the idea of Luna and Celestia having different opinions on how to rule Equestria. Celestia might be more about harmony and peace through sunlight and positive energy, while Luna could believe that the night also has its own power and should be more emphasized. This can lead to interesting conflicts and resolutions within the fanfic.
Fanfics about Luna and Celestia also allow for a lot of world - building. Since they are such important figures in the MLP universe, their fanfics can introduce new elements to Equestria. It could be a new type of magic that only they know about or a hidden part of Equestria that is connected to their origin. This not only adds depth to their characters but also to the overall MLP lore.
They could have the power of creation. Just as Celestia and Luna are associated with the sun and moon, their parents might have been the ones to create these celestial bodies in the first place. This power of creation could extend to the creation of life forms, magical creatures, and even the various elements of the Equestrian world.
One possible storyline could be a friendship story. The human, perhaps a traveler from another realm, stumbles upon Equestria and meets Princess Celestia. They start off as strangers but gradually develop a deep friendship as the human learns about the ways of Equestria and Celestia discovers the unique qualities of the human world. For example, the human could introduce Celestia to new forms of art or music from their world, and in return, Celestia could teach the human about magic and the harmony that governs Equestria.
I'm not sure specifically as there could be many different 'My Little Pony' fanfics where Celestia dies. It could be about the reactions of the other ponies in Equestria, like Twilight Sparkle having to step up in a new way without Celestia's guidance. Maybe it also explores how the balance of day and night is affected if Celestia is no longer there to control the sun.
Another storyline could involve Celestia and Discord having to team up against a common enemy. Maybe an ancient evil that threatens Equestria. At first, they might struggle to work together due to their very different natures. Celestia is all about order and harmony, while Discord is chaos personified. But as they face challenges, they learn to appreciate each other's strengths and develop a unique friendship.