There could be a fanfiction where Mystogan has a premonition about a future threat to Wendy. He then decides to secretly protect her. Along the way, Wendy discovers what he's doing and they have a heart - to - heart. This could lead to a development of romantic feelings between them, or at least a very strong platonic bond as they face the impending danger together.
One popular storyline could be Wendy and Lucy going on a special mission together without the rest of the guild. They might face a unique magical creature that only their combined powers can defeat. Another could be a story where Wendy has to use her healing magic to save Lucy from a mysterious illness. And there could also be fanfictions where they discover a hidden power within their friendship that helps them save the Fairy Tail guild from a great danger.
One interesting storyline could be Natsu and Wendy going on a special mission together. Maybe they have to find a rare magical item that can save the guild. Along the way, Natsu's impulsiveness gets them into some trouble, but Wendy's healing magic and calm nature help them get out of it.
One popular storyline could be Wendy and Natsu teaming up for a difficult mission. Maybe they have to face a powerful dark mage in a remote location. Wendy uses her healing and sky dragon slayer magic to support Natsu, who goes all - out in combat.
In some fanfictions, Jellal and Wendy could be on a mission together. They might face a powerful enemy that forces them to rely on each other's unique magic abilities. Jellal's more offensive and strategic magic combined with Wendy's healing and support magic would make for an interesting dynamic in the story, with their relationship growing stronger as they overcome obstacles.
A plot could involve Mystogan's past coming back to haunt him. An old enemy from his homeland tracks him down in Fiore. This forces him to face his past mistakes and traumas. Alongside his Fairy Tail friends, he has to find a way to defeat this enemy and finally come to terms with his past.
It could develop in a rather unexpected way. Suppose there's a magical accident that causes their minds to be linked for a short time. They get to see each other's deepest fears and desires. This experience could make them more empathetic towards each other. After that, Mystogan might be more protective of Wendy, and Wendy could be more understanding of Mystogan's often - mysterious ways. Their relationship could then evolve from a simple acquaintance in the guild to a pair that has a special connection that is unique to them.
Natsu would also be an interesting choice. Natsu's brash and impulsive nature could contrast well with Mystogan's more reserved and calculated personality. They could start off not getting along but then grow to respect each other during a difficult quest.
One common storyline could be Romeo and Wendy facing typical high school challenges like exams while also having to hide their magical abilities. For example, they might struggle to keep their Fairy Tail magic a secret during a science experiment that goes awry because of their powers.
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.
One idea could be that Mystogan and Natsu have to team up to face a powerful dark wizard. Since Mystogan is usually more reserved and Natsu is hot - headed, their clashing personalities could lead to some humorous and intense moments during the fight.