One great fanfiction idea could be about a character who has both the Rinnegan and Sharingan and uses them to travel through different dimensions in the Naruto universe. They could encounter ancient and powerful beings, and learn new jutsu that combine the unique abilities of both eyes.
One interesting fanfiction idea could be a story where a new character is born with a combination of all three powers. This character would face many challenges as the ninja world would either fear or try to use this unique being for their own gain.
In a Sharingan Naruto Highschool DxD fanfiction, the Sharingan could also play a role in terms of illusions. Imagine a scenario where the character uses Sharingan - based illusions to deceive the enemies from both worlds. They could make a Highschool DxD devil believe they are in a completely different environment like a dangerous Naruto - style forest filled with traps. And for Naruto characters, they could be made to see illusions of their worst nightmares or false threats from the Highschool DxD world, which would make for some really intense and engaging storylines.
His powers would change a great deal. Naruto is known for his brute strength and his ability to never give up. The Sharingan would add a whole new layer of finesse to his fighting style. He could use the Sharingan's genjutsu capabilities to trap his enemies in illusions before hitting them with a powerful chakra - infused punch. Also, he could use it to analyze his opponents' weaknesses more quickly, allowing him to adapt his fighting strategy on the fly.
The power of the Rinne Sharingan could be combined with devil fruits in One Piece. For example, if a character has a logia - type devil fruit and then also acquires the Rinne Sharingan, they could use the sharingan's abilities to enhance their logia powers. Maybe they could use the sharingan's precognition to better control their intangible state when using the logia power.
The Dead Bone Pulse could provide a physical advantage that complements the Sharingan. When using the Sharingan in combat, the user might be vulnerable to close - range attacks. But with the Dead Bone Pulse, they can quickly create bone armor or weapons for self - defense. Also, the bones could be used to set traps that are easier to plan with the Sharingan's predictive abilities.
In a Highschool DxD OC and Sharingan fanfiction, you can incorporate the Sharingan powers in the story by making it a source of mystery and envy among the other characters. The OC could use the Sharingan's ability to enter the minds of others (a more advanced form) to gather information about the devils' plans. This would make the OC a valuable asset to their group. Also, the Sharingan could have a connection to some ancient prophecy in the Highschool DxD world, which would add more depth to the story and make the powers more significant in the overall plot.
If Naruto gets the Sharingan in this fanfiction, he might unlock the power to use some of the Uchiha - specific jutsu. For example, he could potentially use the Fire Style: Great Fireball Jutsu, which is a common Uchiha technique. Also, the Sharingan has different levels of evolution like the Mangekyo Sharingan. If Naruto were to reach that stage, he could gain even more powerful abilities, such as the ability to use Susanoo, which would make him an extremely powerful force in combat.
Well, one way could be using the Byakugan's detailed vision to enhance the Sharingan's ability to predict an opponent's moves. For example, the Byakugan can see the chakra flow in the body, and the Sharingan can then use this information to more accurately anticipate what the opponent will do next. Then, the Rinnegan could be used to manipulate the environment based on this knowledge. So, like if an opponent is about to attack from a certain direction, the character could use the Rinnegan to create a barrier or change the terrain in that area.
Well, normal Naruto mainly relies on his chakra and the Nine - Tails' power. But Dark Naruto with Eternal Mangekyou Sharingan would have unique visual jutsu. He could use the Sharingan's genjutsu abilities on a much greater scale, perhaps even trapping entire villages in an illusion without them realizing.