A swordsman can fit in by being a traveling warrior. He could be like a ronin, wandering from village to village in the Naruto world, offering his sword skills for hire or just looking for worthy opponents. For instance, he might show up at the Chunin Exams to test the skills of the young ninjas.
Well, think about it this way. A swordsman could be a foreigner from a land that has a different form of combat. He comes to the Naruto universe and is initially seen as an oddity. But as he shows his incredible swordsmanship skills, he earns the respect of some ninjas. He could also be a teacher, teaching the ninjas new ways to use weapons in combat. Since the Naruto world already has some weapon - using ninjas like Tenten, a swordsman could bring in a whole new level of expertise. For example, he could teach them about different types of sword forging techniques that are unique to his land, and how to imbue chakra into swords in a more efficient way.
The drunken swordsman can act as a mentor. His unorthodox ways, influenced by his drunken state, can teach Naruto to think outside the box. Naruto might learn new combat techniques or strategies that are different from what he has been taught in Konoha.
A succubus could fit in as a new type of threat. Since the Naruto world already has various threats like the Akatsuki, a succubus with her seductive powers and ability to drain energy could be a unique enemy. For example, she could target the tailed beasts to gain their powerful chakra.
A squib swordsman could fit into the Harry Potter fanfic universe by being a unique kind of hero. They could start out as a character who is mocked by wizards for being a squib. However, when danger comes, their swordsmanship becomes crucial. For instance, if there is a dark magic - based threat that nullifies wands, the squib swordsman can step in and save the day. They could also be a link between the wizarding world and the non - magical world, using their skills from both sides to solve problems.
Sasuke could be one. Since they have a long - standing rivalry, Sasuke, with his own powerful skills, would be a great opponent for Naruto now that he's a master swordsman. They could have an epic battle where sword meets sword and their respective powers clash.
Well, Gojo could be a super powerful outsider. Maybe he comes to the Naruto world to study its unique chakra system. His Infinity ability would be a game - changer. He could use it to easily deflect most ninjutsu attacks. And his Six Eyes could help him detect hidden enemies or traps that normal shinobi might miss.
The swordsman could be developed by giving him a dual - heritage. For example, he could be half - ninja from the Naruto world and half - mage from the Fairy Tail world. This would give him a unique set of skills and a conflicted identity. He might struggle with which side of his heritage to embrace more. Another way is to give him a special sword. The sword could be enchanted with both chakra - based powers and magic, making it a powerful and unique weapon in the crossover.
Rock Lee could be a main character. His unwavering determination and his unique taijutsu skills could make for some exciting fight scenes against the evil swordsman. And Hinata, with her gentle yet strong nature. She might be the one who discovers some of the swordsman's weaknesses through her observant nature and then shares this information with Naruto and the others.
Well, in Naruto fanfiction, Goku and Vegeta might be introduced as legendary figures. Goku's kind - hearted and always - ready - to - fight nature could be seen as an inspiration to some of the younger Naruto characters. Vegeta's journey from a villain - like character to a more complex anti - hero in his own story could be mirrored in the Naruto universe. They could be brought in to help during a major crisis, like when the Akatsuki was at its peak, using their unique powers to turn the tide.
The powers of Ben 10 can fit in various ways. For example, Ben's alien form XLR8's speed could be compared to the speed of some of Naruto's fastest ninjas. In a fanfiction, this could lead to races or chases. Also, Upgrade's ability to merge with technology could be used in the Naruto world. Maybe he could merge with some of the village's defense mechanisms to enhance them.
One potential ally could be Neji. Neji has his Byakugan and his skills in combat. He could see the dark swordsman as an equal in terms of combat ability and form an alliance. Also, Tenten, who is fascinated with weapons. The dark swordsman's sword and his skills with it could draw Tenten's interest, and she might become an ally. They could exchange knowledge about different weapons and fighting techniques.