One way this could work in fanfiction is if there was a prophecy in both universes. A prophecy that foretold of a union between the two worlds that would result in a child with unique abilities. Naruto, being the main character of his universe, is chosen to be that child. Toriko, perhaps having some special connection to this prophecy, becomes his father. This would lead to a lot of interesting storylines, such as Naruto having to adapt to Toriko's family and friends, and learning about the different cultures and powers in Toriko's world.
In this fanfiction idea, it might be that a powerful being from a higher dimension decides to mess with the fates of these two universes. They could manipulate the timelines and genetics in such a way that Naruto is born as Toriko's son. This would completely change Naruto's backstory and his relationship with the Hidden Leaf Village. He might grow up with a whole new set of values and powers influenced by Toriko's world, like having a stronger focus on food - based powers or a different view on combat.
Yes, it's possible if we consider some sort of magical or cross - dimensional library. In the wizarding world, there could be a hidden section that contains fanfiction from other worlds. Harry, being a curious boy, might stumble upon it. Or perhaps in a more modern AU (alternate universe) where Harry has access to Muggle technology and the internet, he could easily find and read Fullmetal Alchemist fanfiction.
It is indeed possible. Consider that the wizarding world is not completely isolated from the Muggle world. There are instances where wizards interact with Muggle things. Harry has Muggle - born friends like Hermione, who has a good understanding of Muggle literature. She could introduce Harry to Sherlock Holmes fanfiction. Also, there might be some magical means of accessing Muggle literature. Maybe there are spells that can retrieve or translate Muggle books. So within the framework of their fictional universes, Harry Potter can very well read Sherlock Holmes fanfiction.
In theory, it's not entirely impossible. If we consider some sort of magical cross - over or a very creative fan theory, perhaps there could be a way for Harry to access this fanfiction. However, in the strict canons of their individual stories, it seems highly unlikely as they exist in different fictional realms with no established connection.
Well, in fanfiction, anything is possible. Writers often create crossovers by bending the rules of different universes. Maybe there's some sort of multiverse theory at play where the worlds collide and Stiles somehow becomes related to Black Widow. It could be that a powerful magic or some advanced technology in this fan - made scenario is responsible for creating such an unexpected family connection.
If we consider Hermione as Edward's mate in fanfiction, it could also be about the clash and fusion of their different cultures. The wizarding culture Hermione comes from is full of spells, potions and magical creatures. The vampire world Edward belongs to has its own set of rules like the Volturi's laws. The fanfiction could explore how they navigate through the differences. Maybe Hermione tries to find a spell to make Edward more comfortable in sunlight, or Edward tries to introduce Hermione to the vampire way of life without scaring her off. Their relationship could be a journey of discovery for both of them.
In fanfiction, the idea of Naruto having a son with Itachi might be part of a complex AU (alternate universe). The story could set up a world where the Uchiha and Uzumaki clans have a different relationship. Itachi, instead of following his original path, gets involved with Naruto in a way that leads to the birth of a son. This could be due to political alliances, or a new prophecy in this alternate Naruto universe that binds their fates together.
If Naruto and Frieza were to encounter each other, in Naruto's universe, it would introduce a whole new level of threat that the ninja world has never seen before. The existing power structures would be shaken. Ninja villages might have to set aside their differences and unite against Frieza. In Frieza's universe, the discovery of a world full of people with unique powers like chakra could change his perspective on conquest. He might see the ninja as valuable assets or new challenges to overcome.
In fanfiction, the idea of Annabeth Chase being Tony Stark's niece might be a creative way to combine two different fandoms. It could be possible that in this fan - made scenario, there was some sort of adoption or a long - lost family connection that was revealed. Maybe Annabeth's parents had some sort of hidden connection to the Stark family that was only discovered in this fictional world.
Well, in fanfiction, anything can be possible. Maybe some sort of multiverse theory could be applied. A strange rift in the fabric of the universes could have occurred, pulling Naruto from his ninja world into Harley Quinn's chaotic Gotham - like world. And then, through some really wild and unthinkable circumstances, they end up in a situation where Naruto could be seen as her son. Maybe Harley Quinn took in Naruto when he was lost in her world and raised him as her own.
The first implication would be a change in Naruto's powers. Toriko's world is centered around food and the unique abilities related to it. Naruto might inherit some of these food - based powers, like being able to enhance his strength by consuming certain rare foods. This would be a huge departure from his normal chakra - based abilities in the Naruto universe.