Naruto is obviously one of the main characters, as the title implies his connection to the fanfiction. There might also be Sasuke. Since Sasuke is often involved in Naruto's story, in this fanfiction, he could be either an ally or a rival in the context of the adamantium - related plot.
In 'naruto adamantium fanfiction', perhaps there could be a plot where Naruto discovers a way to infuse his chakra with adamantium - like properties. This would not only enhance his physical attacks but also his ability to defend. It could lead to new jutsu development that combines the power of his chakra and the strength of adamantium.
Well, it could be really cool. Naruto with adamantium claws would add a whole new dimension to his fighting style. He could use the claws in close - range combat, maybe even combine them with his Rasengan. Picture him slashing through enemies and then following up with a powerful jutsu. It would also change his appearance, making him look more menacing.
Maybe an ancient evil spirit that was sealed away long ago but is awakened by the emergence of the Adamantium bloodline. This spirit believes that the power of the bloodline can be used to break free from its final seals and wreak havoc on the world.
A plot could revolve around a Naruto - like character with the Adamantium bloodline who embarks on a journey to find others with similar bloodlines across different hidden villages. Along the way, they learn about the origin of the Adamantium bloodline, which is tied to an ancient and powerful clan. This discovery leads to a conflict as other villages see this as a threat and try to stop the character from uniting these bloodline - bearers.
The story would change in many ways. For one, his relationships might be affected. Some of his friends might be a bit wary of his new, dangerous weapon. Also, his training would focus more on physical combat skills. He might seek out new teachers or training methods to master the use of the claws. And his enemies would likely target the claws, trying to find a way to disable them, which would add new plot twists to the story.
In the comic world, adamantium doesn't poison Wolverine. It's bonded to his skeleton and gives him enhanced strength and durability rather than causing any harm or poisoning.