Often, an original character created specifically for the fanfiction can be really interesting. For example, a wandering swordsman who has mastered the two - sword style and has a mysterious past. He might have connections to an old war or a lost ninja art, and his interactions with the main Naruto characters add new dynamics to the story.
Another interesting character could be an antagonist. A rogue ninja who uses the two - sword style in a very brutal and unorthodox way. He might not follow the traditional ninja code and is only interested in power. His clashes with the protagonists would be intense as he uses his two - sword skills to try and overpower them. His backstory could involve being exiled from his village for his extreme views on power and combat.
Sasuke would be an interesting character. He already has a proficiency with weapons and his Sharingan would give him an edge in quickly learning and adapting the one - sword style. His brooding nature also adds a certain depth to how he would approach mastering this new fighting style.
Sasuke could be really interesting in this type of fanfiction. Imagine him adapting his Sharingan abilities to work with ice - style jutsu, creating some really cool and powerful combinations.
Kakashi is another character that might show up frequently. He could be Naruto's mentor in understanding the sword's powers or the mysteries behind it. Jiraiya might also be present in some fanfictions. He could have some connection to the sword from his past adventures and pass on some important information to Naruto. Additionally, villains like Orochimaru might be interested in the sword and try to steal it from Naruto, which makes them common characters in these fanfictions.
Sasuke is also a likely candidate. His natural talent with weapons and his quest for power could lead him to explore the Infinite Sword Style. He could use it to enhance his already formidable combat abilities and engage in more intense battles. He might also modify the style according to his own Sharingan - related skills.
Kisame Hoshigaki is often associated with it. Given his shark - like appearance and his use of the Samehada, which is a large and unique sword, he could be easily incorporated into fanfiction involving the 8 Sword Style. His brute strength and combat skills would make for an interesting take on how he might adapt to or already be related to the 8 Sword Style.
Often, the characters who interact with the infiltration specialist are also quite engaging. Naruto himself can be very interesting in these fanfictions. When he meets the infiltration specialist, his naivete about stealth and infiltration can create humorous and also educational moments as he learns from the specialist.
Sasuke could be really interesting in this style of fanfic. His natural inclination towards the darker side in the original Naruto could be further explored. He might take on even more extreme actions and develop new powers related to the dark slayer concept.
Naruto himself is often popular in these fanfictions as he is the main character of the original series. He might be the one to find and master the chakra sword. Sasuke is also a common choice as he is a powerful and complex character.
Perhaps a story where a young ninja, not originally proficient in swordsmanship, is forced to learn the two - sword style to avenge his family. He struggles at first but then finds an unexpected mentor who helps him master the style in a very unorthodox way. As he progresses, he uncovers a conspiracy related to the two - sword style that dates back to the founding of the ninja villages.
Naruto is definitely one of the most interesting. His unique abilities from the Naruto series, like his ability to use different types of chakra and his signature jutsus, make him stand out in the Fairy Tail world. He often brings a new perspective and a different set of skills to the table.