One common theme is mentorship. Since Celestia is a wise and powerful figure, she often takes on the role of mentoring the reader in fanfics. Another theme is adventure. The reader usually goes on some sort of adventure with Celestia, whether it's exploring Equestria or a more magical realm. Friendship is also a big theme, as the relationship between the reader and Celestia develops into a strong friendship in many of these fanfics.
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 great Princess Celestia reader fanfic is 'A Day with Celestia'. It takes the reader on an adventure through Equestria by her side, filled with magic and discovery. Another one could be 'Celestia's Guidance' where she imparts her wisdom to the reader character. There's also 'Celestia's Secret Mission' which has an exciting plot involving the princess and the reader.
It offers a chance for self - insertion into the My Little Pony world. Male readers can imagine themselves in this fantastical world, interacting with such an important character as Princess Celestia. It can be exciting to think about how one would handle the situations, the magic, and the social hierarchy in Equestria. Also, the contrast between the male reader's likely human qualities and Celestia's pony - like and magical ones can lead to some really engaging storylines.
A common theme is sisterhood. Given their relationship as sisters, many fanfics explore the deep bond between them, including how they rely on each other and support one another in ruling Equestria.
It could be another powerful magical being. Maybe a long - lost love from another dimension who has the power to traverse realms and had a brief but passionate encounter with Celestia.
One possible storyline could be that Princess Celestia discovers she's pregnant and has to deal with the political implications within her kingdom. Her pregnancy might cause a stir among the nobles and commoners alike, as they wonder about the future of the realm with an heir on the way.
Character development is key. In a good 'Human x Princess Celestia' fanfic, both characters should grow and change. For the human, they might start off as a naive outsider but become more confident and wise through their interactions with Celestia. Celestia, on the other hand, could become more open - minded towards the human world. For example, if the human challenges some of her long - held beliefs in a respectful way, it could lead to her personal growth.
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.
One great fanfic could be 'Sisterly Bonds' which focuses on their relationship and how they support each other through various challenges in Equestria. It beautifully showcases their different personalities while emphasizing their deep connection.