Their family backstory could be that their parents were both outcasts in their respective worlds. The Naruto - world parent was shunned for having different ideas about chakra use, and the Fairy Tail - world parent was an outcast because of their unique view on magic. They found solace in each other when they accidentally ended up in a neutral dimension. There, they built a home and had Naruto and Natsu. The family was constantly on the move to avoid those who would persecute them for their differences. As Naruto and Natsu grew, they carried the hopes of their parents to create a world where both ninjutsu and magic could coexist peacefully, and their family backstory would be one of perseverance and the search for acceptance.
Their family life would be full of energy. With Naruto's hyperactive nature and Natsu's exuberance, there would never be a dull moment. They would probably be constantly getting into friendly fights and competitions, whether it's over who can eat the most ramen or who can do the coolest magic or jutsu.
If Hermione and Draco were siblings, their family would have to navigate two very different worlds. On one hand, they would have the elitist and often dark - tinged Slytherin world that Draco is a part of. On the other, there's Hermione's world of academic achievement and a more inclusive view of the wizarding community. Their parents would have to balance teaching them magic in different ways. Draco would probably be taught more about the pure - blood supremacy ideas initially, while Hermione would be encouraged to explore all aspects of magic regardless of blood status. It would be a family full of contradictions and debates.
It could be a wild mix of the Naruto and Fairy Tail universes. Maybe Naruto's ninja skills would be passed on to Natsu in some unique way. There could be epic battles with Natsu using Naruto - style jutsu.
In this fanfiction world, Naruto's chakra and Natsu's magic could coexist because they are different manifestations of energy. Naruto's powers are more about internal energy manipulation within his body and using hand signs to release various techniques. Natsu's power comes from eating magic and is more instinctual. Their family could be seen as a bridge between two different power systems. It could be that their family has a special role in maintaining the balance between ninjutsu and magic in the overall fictional multiverse they exist in.
Well, in such a fanfiction, the younger siblings could be part of a new generation of Konoha's protectors. They might form a team with Naruto's friends' younger siblings too. This would create a whole new set of adventures. And perhaps, they could help Naruto in his fight against stronger enemies. They could provide support in ways Naruto didn't expect, like using some secret family jutsu.
Yes, in certain fanfictions Natsu and Wendy are considered siblings. This could be due to various reasons. Maybe the author wants to explore a different family dynamic within the Fairy Tail world. It can add an interesting layer to their relationship, like how they support each other more like family members would. Also, it might change the way they interact with other guild members as well.
In this fanfiction, Naruto would likely face many challenges. He'd have to provide for them, protect them from the village's possible discrimination, and also teach them ninjutsu. He might struggle to balance his own ninja duties with his new role as a caregiver.
Well, it could be really wild. Maybe Naruto ends up in Quahog and has to deal with Peter Griffin's antics. He might use his ninja skills to help Peter out of some crazy situations, like when Peter gets in trouble at the brewery. Or perhaps Stewie would be fascinated by Naruto's jutsu and try to figure out how to incorporate it into his evil (or not so evil) plans.
In such a fanfiction, Natsu would be a force to be reckoned with. As a Mandalorian, he'd have access to advanced technology like jetpacks and blasters, but also his dragon - slayer magic. He could be on a mission to protect a planet or find a lost Mandalorian artifact. His relationship with other characters from 'Fairy Tail' who might also be in this crossover would be different. For example, Happy could be his sidekick in a new way, helping him navigate the Mandalorian world. It would be a story full of adventure and discovery.
Natsu could inherit the ability to use chakra. This would give him an extra edge in combat, allowing him to perform jutsus like Naruto. Maybe he could even learn the Rasengan, which he could combine with his fire magic for a super - powerful attack.