In some fanfiction, Trunks could be involved in a time - travel related plot within the Fairy Tail universe. Maybe he discovers a way to travel through time in this new world, and has to prevent a dark future where the guild is destroyed. He would use his knowledge and skills to change the course of events, while also learning about the different magics and cultures in Fairy Tail.
In some fanfictions, Tobi might have a backstory related to Fairy Tail that was previously unknown. For example, he could be a long - lost member's relative. This would add a new layer of mystery and drama to the story. He could then be on a quest to discover his connection to the guild, all while getting involved in the guild's adventures.
One possible storyline could be Trunks and Videl teaming up for a martial arts tournament. They could combine their unique fighting styles and strategies to face powerful opponents. Trunks' Saiyan power and Videl's skills learned from Gohan would make them a formidable duo.
One interesting storyline could be a character from our world getting transported into the Fairy Tail kingdom and having to learn magic to survive. They could form unexpected alliances with the guild members and go on adventures together.
One interesting storyline could be an alternate version of the Fairy Tail guild's rise to power within the empire. Maybe they face different types of magic and political challenges that are unique to this fanfiction setting.
One interesting storyline could be a group of Fairy Tail characters competing in a university-wide magic tournament. It would be full of action and show off their different magical abilities.
One common storyline is the reunion plot. Lucy's brother has been away for a long time, and when he returns, there are all kinds of emotions and revelations. Another is the protection storyline, where he devotes himself to protecting Lucy from a powerful enemy.
One storyline might involve a young Fairy Tail novice who discovers they have an innate ability similar to Wood Release. This ability sets them apart from their peers and they face both envy and admiration. They have to journey to find out the origin of this power, which leads them to uncover secrets about a long - forgotten connection between their world and Naruto's. Along the way, they face many challenges and grow stronger, all while trying to master their unique Wood - like magic.
One common storyline is Wendy going on solo adventures to discover more about her dragon slayer magic. She might search for lost dragon lore or ancient spells related to her powers.
Another common storyline is the 'power - exchange' type. Here, Alphonse's alchemy somehow combines or clashes with the magic in Fairy Tail. For instance, he might discover a way to use alchemy to enhance the magic of Fairy Tail mages, or vice versa. This creates an interesting dynamic as characters from both universes learn from each other's powers.
A possible storyline is about a character from Fairy Tail who transfers to the Highschool DxD school. They have to adapt to the new environment which is full of devils, angels, and fallen angels. Along the way, they make new friends and enemies, and their Fairy Tail magic causes quite a stir among the students.