It might also represent suppressed emotions. For example, if a character has feelings for another but can't express them openly in the Fairy Tail universe, biting their lip could be a way to hold back those strong emotions. In some fan-created stories, it's used as a subtle sign of a character's internal struggle between what they want to do and what they should do.
One plot idea could be Natsu in a difficult battle where he's biting his lip in concentration and determination. Maybe he's facing an opponent stronger than him, and this little gesture shows his inner struggle. For example, against a powerful dark mage who has some connection to his past.
It can also be a way to show his self - restraint. Natsu is impulsive by nature. So, when he bites his lip, it might mean he's trying to hold back his first instinct. Maybe he wants to rush into a fight, but he knows he has to wait for the right moment, so he bites his lip to keep himself in check.
It adds more content. The official Fairy Tail series has a limited number of episodes and chapters. Fanfiction fills in the gaps. For example, it can create stories about what the characters were doing during the time - jumps in the original story.
If Lucy never joined Fairy Tail, the friendships and relationships among the characters would form in a very different way. Also, many of the story arcs might not unfold as they do in the original plot.
One popular theme is alternate universes (AUs). Writers like to explore what would happen if the Fairy Tail characters were in different settings, like a modern - day high school or a steampunk world. Another common theme is romance. Fans often pair up their favorite characters in different relationships, such as Natsu and Lucy or Gray and Juvia.
Erza and Jellal are also a favored couple in Fairy Tail fanfiction. Their complex past, with Jellal's redemption arc, adds a layer of depth to their potential relationship. It allows for stories that deal with forgiveness, love that overcomes past wrongs, and the growth of their connection over time. There's also Gajeel and Levy, as their interactions in the series suggest a budding relationship that can be elaborated on in fanfics.
You can try websites like FanFiction.net or Archive of Our Own (AO3). FanFiction.net has a large collection of Fairy Tail fanfics. Just search for 'Fairy Tail' in the search bar, and you'll get a bunch of results. AO3 also has high - quality fan works, and it often has more in - depth and unique takes on the Fairy Tail universe.
The condition could be that the main character has to give up their magic for a period of time. This would create a lot of interesting plot twists as they'd have to rely on their wits and the help of their friends in the Fairy Tail guild instead of their magical abilities.