What could be the plot of a 'Naruto Grandfather of Natsu' fanfiction?

Well, it's quite possible. Fanfiction writers are known for their wild and creative ideas. Since both Naruto and Natsu are from popular anime, some writer might have thought of creating a story where Naruto is somehow related as Natsu's grandfather. But it also depends on how much of the respective anime universes the writer wants to blend and how they would explain such a connection in the story.

Well, it could be about Naruto somehow ending up in the Fairy Tail world and meeting Natsu. Maybe they team up to fight a common enemy. Naruto's jutsus and Natsu's dragon slayer magic could combine in interesting ways during battles.

In this fanfiction, it could start with Naruto feeling a strange connection to Natsu. As they meet, they discover their shared blood relation. Then, they embark on a journey to find out more about their family's past. Along the way, they encounter various challenges like facing off against enemies who are after their unique powers. They rely on each other's strengths, Naruto's strategic thinking and Natsu's brute force and magic, to survive and grow closer as brothers.

The plot could involve them discovering their brotherhood. Maybe they start off in different worlds and then some magical or mysterious event brings them together. They then realize they are brothers and start to explore their combined powers to fight against a common enemy.

He could be a powerful and respected shinobi from the Uzumaki clan. Given the Uzumaki's reputation for strong chakra and unique abilities, Naruto's grandfather might have been a key figure in the clan's history.

Another idea is that the fanfic delves into a what - if scenario. What if Naruto's grandfather had been able to change Madara's path? This could lead to a completely different Naruto - verse, where the Uchiha clan's history and the overall power balance in the ninja world are altered. The fanfic could then explore how Naruto's life and his journey as a ninja would be different in this alternate reality.

One possible plot could be that Natsu and Naruto, as brothers, grow up in a world where magic and ninjutsu co - exist. They start off training together, with Natsu teaching Naruto some basic fire - based magic and Naruto showing Natsu his ninja skills like tree climbing. As they grow older, they face a common enemy that threatens both their worlds. They combine their powers, Natsu's brute strength and fire magic with Naruto's strategic ninjutsu and shadow clones, to defeat the enemy and save their loved ones.

His grandfather could be a very strict and traditional ninja. He might have high standards for Naruto in terms of ninja skills and discipline.

In a 'naruto meets natsu fanfiction', they might start off as rivals. Naruto, with his ninja skills and determination, and Natsu, with his dragon - slayer strength. But as they get to know each other better, they realize they have a lot in common. For example, they both have a strong sense of loyalty to their friends. So they end up becoming good friends and combining their powers to protect their respective worlds from threats that could endanger both.

The plot might involve Natsu being lured into a trap by a false Dragonoid. Since he has a strong connection with dragons, the false Dragonoid could trick him into a place where he's trapped. He would then need to figure out how to escape and expose the false Dragonoid for what it really is.