Well, perhaps there's a love triangle in the story. A boy in Fairy Tail High School is in love with a girl, but the girl's best friend also has feelings for the boy. This creates a lot of drama and tension among them, and they have to navigate their friendships and newfound love feelings all at once. And in the end, true love might prevail in a really unexpected way.
Gray could also be a main character. He's cool and mysterious. Maybe he falls in love with a new girl in school who is really into art. She's always drawing in the schoolyard, and Gray is intrigued by her creativity. Another possible main character could be Erza. She's strong - willed and might be the one who helps her friends with their love problems while also having her own secret admirer in the school.
One idea could be that the children of the original Fairy Tail members have to form teams in high school to compete in magical battles, just like their parents did in the guild. This would create a lot of interesting rivalries and friendships.
One common theme is friendship - turned - love. Characters who were friends in the original 'Fairy Tail' story start to develop romantic feelings for each other in the high school setting. For example, Natsu and Lucy might have been just good friends at first but then realize they love each other more deeply.
Another plot could revolve around a big school competition. For example, a magic tournament where different clubs or groups from Fairy Tail High School participate. There could be rivalries, unexpected alliances, and lots of cool magic battles. The story could focus on how the characters train, strategize, and overcome their opponents.
Perhaps in this fanfiction, the school they go to is a special school for different guilds. The Fairy Tail group is there to learn about the history and politics of the magical world. They discover secrets about their own guild's past through the school's archives. Natsu accidentally sets off an old magical trap while exploring the restricted section of the library. This leads to a series of events where they have to work together with students from other guilds to fix the mess. Gray and Natsu have to put aside their usual bickering, and Lucy uses her wits to figure out how to reverse the effects of the trap.
Another plot could revolve around Natsu being the new kid at school and having to earn the respect of his classmates. He gets into various battles and challenges, not just physical ones but also magical duels of wits. His friends from Fairy Tail might visit the school from time to time to help him out or just to see how he's doing. And as he overcomes these challenges one by one, he gradually becomes a respected and feared figure at the school, all while still maintaining his fun - loving and loyal nature.
Well, perhaps it's a story where Gaara, who might be a bit of an outcast at first, falls in love with someone in his high school. It could involve him learning to open up and trust, as he navigates the complex world of high school relationships. There could be rivalries with other students who also have an interest in the same person, and Gaara has to prove himself worthy. He might also grow as a person through this love, becoming more confident and less reserved.
It could be about a wrestler in training in high school who falls in love with a cheerleader. They face challenges like the wrestler's tough training schedule and the cheerleader's busy practice times, but their love overcomes it all.
Maybe it's about Sasuke, a cool and brooding guy in high school, falling in love with a girl who is kind and smart. They could meet in the library, where she helps him with his studies, and slowly feelings develop between them.
Maybe it's about a Pikachu falling in love with a Eevee at high school. They could have adventures together in the schoolyard and share their Pokémon treats.