Obviously, Natsu would be one of the main characters. He's the 'badass' in the title. His fiery personality and powerful magic are likely to be central to the story.
One interesting plot point could be Natsu getting into intense battles within the academy. Maybe he has to face a new kind of dark magic user that challenges his skills in ways he hasn't experienced before.
It could be about Natsu being a really cool and tough character in a Fairy Tail high school setting in a fan - created story. Maybe it involves his adventures, his relationships with other characters from Fairy Tail in a high school context, like his friendships or rivalries.
I'm not sure exactly as it's a fanfiction. But it might be about Natsu in a high school setting in the Fairy Tail universe, being a badass, which could involve him getting into cool adventures, showing off his powers, and having some sort of unique relationships with other characters from Fairy Tail in this high - school - themed scenario.
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.
In some fanfictions, there might be a tournament - style event at the Fairy Tail Academy. All the students get to show off their unique skills and magic. The underdog characters, those considered not so strong initially, might surprise everyone with their hidden talents and strategies. This kind of storyline creates a lot of tension and excitement as you cheer for your favorite characters.
Lucy is also quite popular. She has a unique magic ability and her character growth throughout the fanfictions is interesting. She might start off as a bit of an outsider but gradually becomes an integral part of the group at the academy.
One possible scenario could be that the new kid is a huge fan of Natsu and joins Fairy Tail School Academy hoping to meet him. The new kid might be really nervous at first, but then Natsu's warm and friendly personality makes him feel welcome. Natsu could show the new kid around the school, introducing him to all the cool magical things there.
Natsu is surely one of the main characters as the title implies. There might also be other Fairy Tail characters like Lucy, Gray, and Erza. They could be Natsu's friends or classmates in this high school fanfiction.
Most likely Natsu would be one of the main characters. And probably Lucy, Gray, and Erza from Fairy Tail could also be main characters as they are often associated with Natsu in the original Fairy Tail series.