If Naruto ate the Pika Pika no Mi in fanfiction, he'd be a really unique character. He could potentially use his new light - based powers in combination with his existing ninja skills. For instance, he could use light clones instead of shadow clones. And his rasengan could be infused with light energy, making it even more powerful and destructive. His mobility would also change as he could move at the speed of light in certain situations, allowing him to quickly get in and out of battles.
Naruto's character development would be quite interesting. With the Pika Pika no Mi, he would start to view battles and challenges from a different perspective. He might become more strategic, using his light powers to outwit his opponents. Also, his relationships with other characters could change. Some might be in awe of his new powers, while others might be a bit jealous. He'd also have to deal with the limitations of the devil fruit, like not being able to swim, which could add an element of vulnerability to his otherwise fearless character.
A Logia of 'Crystal' could be really interesting for a male OC in a One Piece fanfiction. He could transform into various crystalline structures. He could use these to refract light and create illusions, or he could form sharp crystal shards to attack. Also, his body in crystal form could be extremely durable, making him a tough opponent. In battles, he could even create crystal mazes to trap his enemies.
In a Konoha fanfiction where Naruto has a Logia Devil Fruit, he could have amazing new powers. For example, if it was a fire - based Logia fruit, his Fire Style jutsu could be enhanced to a whole new level. He might be able to transform his body into fire completely, making it difficult for enemies to land a hit on him. Also, this new power could change the power dynamics in Konoha, as he would be even more formidable against threats both inside and outside the village.
One of the popular characters in Harry Potter logia fanfiction is Severus Snape. His complex character and his role in the original story give a lot of room for fanfiction writers to explore. They might write about his early years at Hogwarts, his relationship with Lily Potter in more detail, or even create alternate endings where his fate is different. Another popular character is Ginny Weasley. Fanfictions may focus on her development as a powerful witch, her relationship with Harry, or her adventures independent of the main story.
Another fanfiction concept could involve Naruto being sent to the One Piece world through some kind of strange ninja jutsu gone wrong. There, he eats a Logia Devil Fruit that allows him to turn into water. He teams up with the Straw Hat Pirates and uses his water - based powers, along with his ninja knowledge of chakra control, to help them in their adventures. For example, he could use his water form to put out fires on the ship or create water - based defenses against enemies.
There's also 'Logia Oc: The Hidden Power'. In this fanfiction, the oc has a logia power that is initially misunderstood. The author does a great job of gradually revealing the true nature and potential of this power as the story progresses. It has an interesting plot with many twists and turns.
Well, in some Harry Potter logia fanfiction, there are ideas about new magical creatures. Maybe a creature that is a hybrid of two known ones, like a hippogriff and a unicorn. Also, there could be ideas about different forms of magic. For instance, a type of magic that is based on emotions rather than spells.
One common theme is power exploration. Since Logia abilities from Naruto are often very powerful, fanfiction writers like to explore how these would fit into the One Piece world. For example, how would they compare to Devil Fruits?
Well, if Naruto had a Logia Devil Fruit, it would completely change his power set. He could become intangible like most Logia users. For example, he could turn into an element and avoid attacks easily. His combat style would be more about strategic use of his new intangible form rather than just relying on his ninja skills.