In a fanfiction where Lucy finds Igneel, it could start with Lucy having a vision about Igneel. She then becomes determined to find him. When she does, Igneel could be in a hidden lair. Lucy and Igneel might form an unexpected bond. Igneel could teach Lucy some powerful dragon - slayer magic, which would be a huge advantage for her. And she could use this new power to fight against the dark forces that are threatening the Fairy Tail guild.
One significance could be the emotional boost for Natsu. After so long without Igneel, having him back would be a huge source of comfort and strength. Natsu could become even more determined in battles.
Lucy could be extremely excited. After all, finding Igneel is like stumbling upon a legend come to life. She would likely be in awe of his presence. She might immediately think about how this discovery could benefit her friends in the Fairy Tail guild. She could also be very respectful and try to approach Igneel in a friendly manner.
Perhaps the new keys are part of a prophecy. In the Fairy Tail universe, prophecies are common. So, Lucy finding these keys could be the start of fulfilling a great prophecy. It could involve saving the world from a dark magic that only she, with her new celestial spirits summoned by the keys, can stop. This would not only test her strength but also her loyalty to Fairy Tail and her friends.
One possible plot could be that Igneel's arrival in Fairy Tail brings a new level of power and protection. He could start training the mages in new and powerful dragon - slaying magic, making Fairy Tail even more formidable against their enemies.
It could be a story where Natsu and Lucy are at a guild celebration. They start to dance, and Natsu's clumsy yet enthusiastic moves make Lucy laugh. As they dance, they might share some unspoken feelings, and their friendship could deepen. It could be filled with magic and the warm atmosphere of the Fairy Tail guild.
I'm not sure if there is a specific fanfiction with the exact title 'naruto is igneel fairy tail fanfiction'. Fanfictions can be quite diverse. It might be a very creative crossover where the author imagines Naruto in the world of Fairy Tail with a connection to Igneel. Maybe Naruto has some of Igneel's powers or characteristics in this fictional scenario.
A group of rogue dragon slayers who have turned to the dark side could be the main antagonists. They envy Igneel's relationship with Natsu and Fairy Tail. They believe that dragons should rule over humans and plan to use their powers to subjugate the world. Igneel and Fairy Tail must stop them.
In this fanfiction scenario, their life would be full of adventures. Natsu's impulsive nature combined with Lucy's more level - headed approach would make for some interesting dynamics. They might go on quests together, with Natsu leading the charge in battles and Lucy using her Celestial Spirits to assist. Their home would probably be filled with mementos from their travels, and they'd have a lot of stories to tell their friends at the guild.
Well, in this fanfiction, Igneel's return could bring a huge shift in power dynamics. His relationship with Natsu might be explored more deeply, like they could have some intense training sessions. Also, it might lead to new quests for the Fairy Tail guild as Igneel's knowledge could be used to combat stronger enemies.
It could change the course of events significantly. Maybe Natsu would have had more guidance and become even stronger.