Perhaps there could be a search for a new leader. Different ponies could come forward, each with their own ideas on how to lead, leading to internal power struggles within Equestria. Some might believe in following Celestia's old ways strictly, while others want to break new ground. This could create a lot of drama and conflict in the fanfic.
Another plot could revolve around the magic in Equestria going haywire after Celestia's death. Since she was a powerful magic user, her absence could cause all kinds of strange magical phenomena. Ponies might have to figure out how to stabilize the magic, and there could be a young, inexperienced pony who discovers they have a special connection to Celestia's magic and is tasked with saving Equestria from the chaos.
One possible plot could be the ponies in Equestria struggling to come to terms with the loss of their beloved leader. They might face challenges in maintaining order and harmony without her wisdom and 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.
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.
Maybe Trixie fails at a really important task. For instance, she was supposed to protect Ponyville from a certain threat using her magic, but she fails miserably. This failure weighs heavily on her, and she becomes sad and full of self - doubt. She might start to isolate herself from the other ponies as a result.
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.
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.
One great MLP Princess Celestia fanfic is 'The Sun's Daughter'. It delves deep into her backstory and her relationship with Luna. It shows a more vulnerable side of Celestia which is really interesting.
One interesting aspect of MLP Celestia and human fanfic is the exploration of different relationships. It could be a friendship between a human and Celestia. The human might bring new perspectives from the human world, like different forms of art or technology concepts that are alien to Equestria. This can lead to some really fun and creative storylines.
A plot might revolve around the friendship of the main ponies being tested. With Nightmare Moon in power, they could be separated or forced to betray each other. There could also be a plot where Nightmare Moon discovers a new threat that she needs the ponies' help to face, despite her victory, leading to a strange alliance.
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.
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.