One possibility could be that his relationships with other characters would change drastically. For example, his friendship with Yukio might become more protective on Yukio's part as he now has a sister - like figure in Rin. Also, his interactions with the other exorcist trainees could be different. They might be more hesitant around him as a girl, or some might be overly friendly in a different way.
The story would change in terms of the romantic sub - plots. If Rin was a girl, there could be new love interests emerging. Maybe some characters who were just friends before would start to have romantic feelings for her. For example, Bon might see her in a completely different light and develop a crush.
In a fanfic where Rin is secretly a girl, the author could explore themes of identity and self - discovery. Rin might struggle with coming to terms with her true gender while also dealing with the challenges of being an exorcist. It could add a whole new layer of depth to the character and make for a very engaging story.
Check out the official Blue Exorcist forums if there are any still active. Sometimes, fans post their fanfics directly on these forums for others to read and comment on. Also, don't forget to look at the comment sections of Blue Exorcist - related YouTube videos. Sometimes, fans will mention great fanfics they've read in the comments, and you might be able to track them down from there.
Well, one thing that could happen is that her relationships with other characters would shift. For instance, some male characters who were just friends might start having different feelings towards her. And she might face different challenges from other female characters who could be jealous or supportive in different ways.
Some fanfics focus on Rin's power development in a different way from the original story. Maybe she discovers new powers or has to learn to control her existing ones in a more challenging situation. There are also fanfics that explore Rin's family relationships in more depth, especially her connection to her father. This could involve flashbacks or new revelations about her family's past.
One great fanfic could be 'The Bond Beyond Worlds'. It delves deep into the relationship between Amaimon and Rin. The author beautifully portrays how their unique connection evolves over time, with Amaimon's mischievous nature clashing and yet also complementing Rin's more determined and righteous personality. It's filled with exciting adventures and some really heart - warming moments that fans of the pairing will surely enjoy.
In 'Blue Exorcist Rin fanfic', a very frequent theme is Rin's battle against his inner demons, both literally and figuratively. His journey to master his demonic powers while still remaining true to his human side is often explored. Also, his relationship with the exorcist community, whether it's facing discrimination or finding acceptance among them, is a common theme. Additionally, his friendships, especially with the people he meets at True Cross Academy, are often a big part of the stories.
A powerful demon who has a long - standing grudge against Rin's father could be the main antagonist. The demon realizes that with Rin turned into a baby, he is at his weakest. So, the demon decides to target Rin. He could send his minions to kidnap baby Rin and use him as bait to draw out any remaining power or secrets that Rin's father might have left behind. This would force Rin's friends and allies to fight against the demon's forces to save him.
One popular Rin x Izumo fanfic is 'The Unspoken Bond'. It delves deep into their relationship, exploring how their different personalities interact. The story shows how Rin's brashness and Izumo's more reserved nature create an interesting dynamic. Another good one is 'Under the Cherry Blossoms', which is set in a beautiful, almost dream - like world where their feelings for each other start to blossom.