The plot might revolve around Naruto growing up in a different world or with a different family dynamic due to being the son of Laxus. He could face challenges in both the ninja world and the world of Laxus' origin. He may have to prove himself to both the ninja clans and the magic guilds. He might struggle to fit in at first but then use his unique combination of abilities to become a great hero in both realms.
In this fanfiction plot, Naruto could be brought to the Fairy Tail world as a young child. Laxus, being his older brother, takes it upon himself to protect Naruto. As Naruto grows, he discovers his own unique brand of magic that is influenced by his ninja abilities. They get involved in a big conflict where the guild is split into different factions. Naruto and Laxus have to use their combined strength and their unbreakable brotherly bond to reunite the guild and defeat the external threats that are taking advantage of the guild's internal strife. This could be a story full of action, emotion, and the exploration of two very different yet similar characters.
The plot could start with Naruto's arrival in the Fairy Tail world. As Laxus' older brother, he would immediately take on a protective role. He could use his rasengan and other jutsu to fight off enemies that threaten Laxus or the guild. Naruto might also try to bridge the gap between the two different power systems - chakra and magic. Along the way, there could be a lot of character development for both Naruto and Laxus. Laxus could learn about Naruto's past and the struggles he had in his own world, which would inspire him to be a better mage. And Naruto would adapt to the Fairy Tail world, using his skills to help the guild grow and protect it from internal and external threats.
In addition to Naruto and Laxus, there could be characters from the world where Laxus comes from. Maybe some of his comrades in the magic guild. They could be curious about Naruto, or they could be skeptical of him because he is from a different world. And of course, the villains in the story would be important characters too. They could be after Naruto's power or trying to disrupt the balance between the ninja and magic worlds because of his existence.
Well, perhaps Laxus has some misguided notion that Lucy has information vital to the guild's safety. So he kidnaps her thinking he can extract it from her quickly. But in reality, Lucy has no such information and she has to convince Laxus of that.
Well, perhaps the story could start with a powerful magic spell gone wrong that turns Laxus into a baby. His friends might be shocked at first. They then have to take care of him, like feeding him and changing his diapers. It could be a really comical situation with his big, tough personality now trapped in a baby's body.
In a 'naruto son of bellatrix fanfiction', perhaps Naruto has some of Bellatrix's wild and unpredictable nature. He could be on a journey to discover his true identity and how he came to be Bellatrix's son. This might lead him to explore the secrets of the wizarding world and his own ninja abilities in a new light.
Well, one possibility could be that Naruto inherits some of Gilgamesh's arrogance along with his power. Maybe he has a special ability to summon ancient Babylonian weapons. And he could use this in his battles in the Naruto world, like against the Akatsuki.
One possible plot could be that Naruto discovers his true heritage as the son of a princess from a hidden kingdom. He then has to deal with the politics and expectations of the royal family while still maintaining his ninja ways. Maybe he has to protect the kingdom from a new threat using his ninja skills.
In such a fanfiction, perhaps Naruto could be shunned by the village from the start. His 'devil' heritage might give him strange powers that he has to hide. He could struggle with self - identity, different from the Naruto in the original who is seen as a hero. Maybe he has to fight against the prejudice of the people who believe the devil's son can only bring destruction.
Well, it could be about Naruto having powers related to Hades on top of his ninja skills. Maybe he can control the dead or has some sort of underworld - like abilities that he uses in battles against the Akatsuki. He might also have to deal with the stigma of being the son of Hades in a world that doesn't understand such a thing.