They can change her appearance. Maybe make her look more menacing, with darker colors in her mane and tail, or a more stern expression. For example, her eyes could be drawn to look cold and unfeeling.
One common theme could be the exploration of power. Since Celestia is often depicted as a tyrant in this context, it might show how power can corrupt. For example, stories could focus on how her tyrannical rule affects the ponies in Equestria, like restricting their freedoms or imposing unfair laws.
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.
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.
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 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.
A common theme in these fanfics could be the human's journey in the world of MLP. They might start as a lost soul and Celestia could be their guide. This creates a mentor - mentee relationship that can be really engaging to read about.
Create an interesting plot. It could be a conflict between order (represented by Celestia) and chaos (represented by Discord). Or it could be a story where they have to cooperate against a common enemy. Make sure the plot has a clear beginning, middle, and end. For example, start with Discord causing some minor chaos in Canterlot, Celestia tries to stop him in her usual way but fails. Then a bigger threat emerges that forces them to work together. In the end, they either defeat the threat or find a new balance between order and chaos.
Well, the plot could involve Celestia and Discord having to team up to save Equestria from a new, unknown threat. Maybe a powerful dark magic that neither of them can handle alone.
The popularity of MLP Celestia fanfic can be attributed to multiple things. Celestia has a large fan following due to her important role in the MLP universe. Fans love to create and read stories about her to better understand her character. Additionally, the MLP community is known for its collaborative and creative nature. Writers often share their ideas and build on each other's work, which leads to a wide variety of Celestia - centered fanfics. This, in turn, attracts more readers and keeps the popularity of these fanfics high.