Well, the plot could involve Natsu being the sole survivor of a great catastrophe that wipes out the rest of Fairy Tail. He might then embark on a journey to revive the guild. He could search for lost magic or artifacts that could bring his friends back. Maybe he'd face off against new and powerful enemies who were responsible for the destruction in the first place.
One possible plot is that Natsu is somehow protected from a deadly curse that kills everyone else in Fairy Tail. He then has to deal with the guilt and loneliness. He starts to explore the world alone, only to find out that there are remnants of Fairy Tail's magic scattered around. He tries to gather these to recreate the guild, and along the way, he meets new allies who help him in his quest.
The plot could be that Natsu is in a different dimension when Fairy Tail is destroyed. When he returns, he is devastated. He decides to use his dragon slayer powers to their fullest extent. He goes on a rampage to find out who did this and why. Along the way, he discovers secrets about Fairy Tail that were never known before. He might also find a way to bring his friends back, like by traveling through time or finding a powerful magic spell.
Natsu would likely become more solemn. He was always the fun - loving, energetic one. But with Fairy Tail gone, he'd have to grow up fast. He might become more calculating in his battles, instead of just charging in like he used to.
It could be about Natsu having left Fairy Tail for some reason and then reuniting with the guild in a very unexpected way. Maybe he has new powers or a different outlook on life that causes some friction and also some amazing moments of reunion and growth within the guild.
Well, one possibility is that Natsu could join Fairy Tail in a different way than in the original story. Maybe he has some special mission before officially becoming a member. For example, he has to prove his loyalty by helping an elder member with a personal problem.
One possibility could be that Natsu is attacked due to a misunderstanding within the Fairy Tail guild. Maybe a new member misinterprets Natsu's actions as a threat and attacks him in self - defense.
Well, in these fanfictions, a frequent theme is the power of love. Natsu's love for Fairy Tail is so strong that he is willing to give his life. This can also lead to themes of inspiration for the other guild members. His death might inspire them to become stronger or to uphold the values he fought for. Additionally, there can be themes of afterlife or resurrection speculations, as fans might be interested in whether Natsu could come back in some way, which adds an element of hope to the otherwise tragic scenario.
Well, a common scenario is that Natsu dies in a battle against an ancient and powerful demon. He fights bravely but the demon's power is overwhelming. Natsu realizes that the only way to stop the demon from destroying the world is to use a self - destruct type of magic move. He does it, sacrificing himself for the greater good. Another could be that Natsu is tricked by a dark wizard into a magic - trapping spell. His friends try their best to break the spell but it drains Natsu's life energy until he dies. And there's also the possibility that Natsu's overuse of his dragon - slayer magic due to a series of intense battles causes his body to give out and he passes away.
One possible plot could be that there is some sort of misunderstanding or dark magic at play that causes Natsu and Mavis to fight. Natsu, being hot - headed, jumps into the fray without fully understanding the situation. Mavis, on the other hand, is trying to figure out a way to stop the fight without harming Natsu. As the battle progresses, they both start to realize that they are being manipulated and then team up to face the real enemy.
One possible plot could be that the guild goes into deep mourning. Gray might blame himself, thinking he could have protected Natsu. Lucy could be in a state of shock and disbelief, and she might start writing in her diary about all their adventures, as if reliving the memories to deal with the pain.
One possible plot could be that Natsu has been living a different life away from Fairy Tail. Maybe he was raised by another guild unknowingly. When he finally joins Fairy Tail later, he has to prove himself to the existing members who are skeptical of his late arrival. He might have unique magic skills he developed elsewhere that surprise everyone.
The story could start with Natsu being tricked by a powerful enemy and sent to a far - off and unknown land. As a lost Fairy Tail member, he would have to rely on his instincts and the little magic he has left. He might meet new allies who help him in his journey back to Fairy Tail, all while learning important lessons about friendship and the true strength of his guild.