One idea could be Natsu leading a special mission within the guild that no one else has been able to complete. Maybe it involves a powerful dark magic that only his alpha - like determination can overcome.
Perhaps a plot where Natsu discovers a hidden part of his powers as an alpha in the Fairy Tail guild. This could lead to him having to train in secret to master these new abilities while still participating in regular guild activities. He might face some internal struggles as he tries to keep this a secret from his friends.
A great plot could be that an outside force challenges the Fairy Tail guild specifically targeting Natsu as the alpha. This outside group believes that by taking down Natsu, they can take over the guild. So Natsu has to fight not only for himself but for the entire guild, and in the process, he unites the guild members even more.
In a 'Fairy Tail New Guild Fanfiction', you could have a plot where the new guild is formed from the remnants of the old Fairy Tail guild after a great war. The members are trying to rebuild and regain their former glory. However, they face many difficulties such as lack of resources and being shunned by other guilds. As they struggle, they come across a young wizard with extraordinary potential. They take this wizard under their wing and train them. This young wizard then becomes the key to helping the new guild overcome their problems and rise to new heights. The story could also include the relationships between the new and old members, how they adjust to each other, and the growth of the guild as a whole.
One possible antagonist could be a dark wizard from a rival guild who is jealous of Natsu's status as an alpha in Fairy Tail. This wizard might try to undermine Natsu's leadership and the guild's reputation.
One idea could be a mission where Natsu and Laki are paired up by accident. Laki, being more of a support - type mage with her wood - based magic, could initially be intimidated by Natsu's brash and powerful fire magic. But as they face challenges together, she learns to stand up to him and they develop a mutual respect. For example, they might encounter a powerful earth - based monster that is immune to Natsu's fire. Laki's ability to manipulate the surrounding trees to entangle the monster gives Natsu the chance to figure out a new strategy to defeat it.
One idea could be that Natsu is exiled due to a false accusation of using dark magic. He then has to journey alone to prove his innocence, encountering new friends and foes along the way. Maybe he discovers a new form of magic during his exile.
One idea could be Natsu going on a solo mission to a far - off land that has a different type of magic entirely. He has to learn to adapt and control this new magic to complete his task. Another could be Natsu training a new generation of Fairy Tail wizards, passing on his unique brand of magic and combat skills.
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.
One interesting plot idea could be Natsu going on a special quest with each member of his harem separately. This would allow for character development of both Natsu and the individual harem members. For example, when he's with Lucy, they could discover a new type of celestial spirit magic that only works in a specific, long - lost realm. Another idea is that an enemy targets Natsu's harem to get to him, so he has to protect them all while also dealing with his growing feelings for each of them.
In this fanfiction, Natsu could discover that his abandonment was part of a bigger plan within Fairy Tail to protect him from a greater threat. He might initially be angry and resentful, but as he uncovers the truth, he has to decide whether to forgive his old guild or not. He could also meet other characters who were also once abandoned and form a bond with them to face the challenges together.
One plot idea could be that Zeref discovers a way to reverse his curse through Natsu. Since Natsu is his creation, there might be some hidden connection that could be explored. Maybe Zeref tries to use Natsu's unique dragon - slayer magic to break the chains of his dark magic.
One idea could be Natsu crossing over into a modern-day world. He'd be confused by all the technology but use his magic in unexpected ways, like using fire magic to power up electrical devices. Another could be a crossover with a different anime world where Natsu has to team up with new characters to fight a common enemy. For example, in a world full of mecha, he might use his fire to overheat the enemy mechas.