The Magma Magma Fruit could change the Naruto universe by introducing a new type of power. It would add a more elemental and destructive force. For example, battles would become more intense as characters with the fruit's power could create magma pits and lava flows. This would change the battle strategies of the ninja. They would have to learn how to avoid being burned by the magma or use water - based jutsu more effectively. Also, villages near volcanoes would have to be more cautious as a character with the Magma Magma Fruit could potentially cause volcanic eruptions on purpose.
One interesting plot could be a crossover where a character from Naruto somehow gains the Magma Magma Fruit power. For example, Naruto himself could obtain it and use the magma abilities in combination with his own chakra powers. He might use the magma to create new jutsu, like a magma - enhanced Rasengan. Another plot could involve a villain from the Naruto world using the Magma Magma Fruit to try and take over the Hidden Villages. They could create massive magma constructs to attack the villages, and the heroes would have to find a way to counter this new and powerful threat. And perhaps a side character in Naruto discovers the fruit and has to learn how to control its power while also dealing with the politics and rivalries within their own village.
One of the most memorable characters could be the rival trainer. They often push the Magma Kid to become better. Another is the wise old Pokemon professor who gives the Magma Kid advice and guidance. And there's the leader of the opposing team, like the leader of Team Aqua if it's a story that involves that rivalry. They add conflict and drama.
One common theme is the clash of ideologies. Akainu has a very strict and uncompromising view of justice in his original story, while Naruto has a more forgiving and rehabilitative view. So when they interact in fanfiction, this clash often forms a central theme.
One good Admiral Akainu fanfiction could be 'Akainu's Redemption'. It might explore his character in a new light, showing his journey towards a different perspective. Another could be 'Akainu in the New World' which could detail his adventures in uncharted territories. There's also the possibility of 'Akainu's Hidden Past' that delves into his backstory and what made him the person he is in the original story.
Well, it could be about Naruto having to deal with the strict and fiery nature of Akainu as his father. Maybe Naruto has to adapt to a more military - style upbringing while still holding onto his own ninja values.
I'm not entirely sure what about this 'One Piece' fanfic has made you furious. Maybe the author took some liberties with Akainu's character that you didn't like? For example, if they made him act out of character in a way that didn't seem true to the original 'One Piece' story.
It could be that the fanfic misrepresented Akainu's power levels. In 'One Piece', Akainu is a very powerful character, and if the fanfic made him seem weak or overpowered in an unrealistic way, that would be annoying.
I'm not sure specifically what that 'akainu this bites one piece fanfic' is about without reading it. It could potentially be a fan - created story in the One Piece universe that focuses on Akainu and some sort of 'biting' action, which might be a metaphorical or literal element in the story.
One possible plot could be that Akainu attacks the Straw Hat's new island, endangering Luffy's friends. Luffy, filled with rage, challenges Akainu. After an intense battle, Luffy discovers a new form of his Gear ability that allows him to withstand Akainu's magma and finally defeat him.