Discord's character could be developed by exploring his past. Maybe there was a reason he became so attached to chaos. As he interacts with Celestia, he could start to understand the value of order on a more personal level. For instance, he might see how Celestia's ordered rule benefits the ponies of Equestria and have a change of heart, at least to some extent. He could also develop a sense of loyalty towards Celestia as they face various adventures together.
Their relationship could be developed through shared experiences. They could start off as adversaries, but as they are forced to rely on each other in difficult situations, they grow closer. Celestia could teach Discord about responsibility and he could teach her about having fun and not being so uptight. This mutual learning process would not only develop their individual characters but also strengthen their bond in the fanfic.
For Celestia, her character could be developed by showing her struggle with her own perfectionism. When dealing with Discord, she might realize that her rigid view of order isn't always the best solution. This could lead to her becoming more flexible and open - minded. For example, she could start to see the beauty in Discord's chaos in some situations.
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.
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.
For Celestia, her hyper aspect could be developed by showing her constantly pushing the boundaries of her magic. Maybe she starts off being able to do basic sun - related magic, but as the story progresses, she discovers she can use her hyper magic to create new sun - powered spells. For the futa characters, their development could be about coming to terms with their unique identity in Equestria. They could start off being a bit shy about it and then grow more confident as they face challenges with Celestia.
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.
Their relationship can be developed through shared adventures. For example, if they go on a quest to save Equestria from a new threat. During this time, they'll have to rely on each other, which will strengthen their bond.
You can start by looking on fanfic websites like Fimfiction. They usually have a search function where you can type in 'MLP Celestia Discord' and browse through the results. Check the ratings and reviews to see which ones are popular and well - liked.
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 fanfic could be about Celestia and Discord having to team up to save Equestria from a new, powerful dark force. They start off not trusting each other but as the story progresses, they learn to work together and even become friends.
You can start by looking on fanfiction websites like Fimfiction.net or Archive of Our Own (AO3). These platforms often have a wide variety of fan - created stories. Just use the search function and type in 'MLP Discord and Celestia' to see what's available.
Another theme is the redemption arc through love. Discord might be seen as a character who changes for the better because of his love for Celestia. This can involve him learning to be less chaotic and more understanding, all in the name of love.