A powerful Raikage - like character as an OC would be great. This character could be extremely strong in physical combat and have a no - nonsense attitude towards protecting Kumogakure.
An OC who is a young genin just starting out in Kumogakure. They could be friends with some well - known canon characters and learn from them. This young genin could have a special talent for finding hidden treasures or secrets within the village, which could lead to all kinds of adventures.
Sif from Asgard is a great candidate. Her loyalty and warrior spirit would contrast well with the OC. And then there's Kitty Pryde. Her intelligence and phasing ability could lead to some really cool scenarios where she helps the OC out of tricky situations, and of course, romantic relationships could develop from there.
A wise old mentor figure could be interesting. This character could be human and have a lot of knowledge about the world that they can pass on to the non - human protagonist. For example, a retired professor who has studied anthropology and can help the non - human understand human cultures.
A group of thieves could also be included. They might initially try to steal from the Prince of Darkness but end up getting caught in his web of power and secrets. Their street - smart skills and lack of scruples could create some interesting dynamics as they interact with the Prince and other more noble characters.
The nosy neighbor can be an interesting addition. They might have their own opinions on whether the couple should love their home or list it. Maybe they're jealous and want the couple to move, or they could be overly attached to the neighborhood and try to convince them to stay.
Well, if it's a crossover with Ultraman, Ultraman could be a great addition. His super strength and light - based powers would contrast well with the Jetman's abilities. They could have a friendly rivalry at first but then team up to face a powerful kaiju that is threatening both their worlds.
Definitely Obito. Since they have a long - standing connection, it would be interesting to see how their relationship played out during Kakashi's Anbu days. Maybe Obito was still alive and had his own secret missions within the Anbu that intersected with Kakashi's.
There could be a powerful wizard from a far - off land. This wizard has knowledge of ancient magic that could help or hinder the Son of Neptune. Also, a group of dwarven - like creatures who are excellent craftsmen. They could create special weapons or tools for the Son of Neptune's journey. Additionally, an exiled god who sees the Son of Neptune as a means to regain his former glory.
Darui is another popular one. He's a strong shinobi from Kumogakure and his laid - back yet powerful nature gives a lot of room for fanfiction writers to explore different storylines. Writers can focus on his growth as a ninja, his relationships with other Kumogakure shinobi, or his missions outside the village.
Obviously, Merlin himself. And Arthur could be in it too. Maybe Arthur doesn't initially recognize Tiny Merlin and there are some comical misunderstandings between them.
Definitely Sasuke. His rivalry and later friendship with Naruto is a central part of the Naruto story. In a fanfiction about a Naruto force, Sasuke's skills and his unique Sharingan abilities would be very useful.