Another character that is frequently paired with Naruto Fernandes is Sakura. In fanfiction, they might go on medical missions together, with Naruto Fernandes learning more about Sakura's skills as a medic - ninja. Their relationship could develop into a deep friendship or even something more romantic, depending on the direction of the fanfiction.
Sasuke is often paired with Naruto Fernandes in fanfiction. Their complex relationship in the original Naruto series lends itself well to new and interesting storylines in fanfiction. They could be on a new mission together, or perhaps have a different kind of rivalry that goes beyond the typical power struggle.
Kakashi could also be paired with Naruto Fernandes. Given Kakashi's experience and wisdom, in fanfiction they could embark on a mentoring - like journey. Kakashi could teach Naruto Fernandes some new and rare ninja techniques, and they could face various challenges together, like fighting against a powerful new enemy that has emerged in the ninja world.
Often, Naruto himself is paired with Minamoto no Raikou in fanfiction. Their different personalities and abilities can create interesting interactions. Another character could be Sakura. Her medical skills combined with Raikou's combat abilities could make for an interesting team - up.
Naruto is often paired with Rebi. Their personalities can create interesting dynamics, like Naruto's optimism contrasting with Rebi's possible more reserved nature. It makes for great story - building in fanfiction.
Another popular character to be paired with the 'brother of Naruto' is Hinata. The brother could be protective of Hinata's relationship with Naruto or he could develop his own feelings for her, creating a love triangle situation which adds a whole new layer of drama to the fanfiction.
Kakashi could also be a popular character to pair with Naruto in such fanfictions. Given Kakashi's experience and wisdom, he could guide Naruto in understanding and mastering his beast form, and they could go on missions together with Naruto's new abilities.
Naruto is often paired with Ebisu Sensei in fanfiction. Since Ebisu was assigned to train Naruto at one point, many fanfictions build on that relationship, showing how Naruto grows under his tutelage and how Ebisu has to adapt to Naruto's unorthodox ways.
Sasuke is often paired with 'Naruto reborn as a girl'. Their relationship, which was already complex in the original series, takes on a whole new dimension when Naruto is a girl. There's a lot of potential for a romantic or at least a very deep emotional connection. Another popular character to be paired with her is Kakashi. He could be a mentor figure, but also there could be some underlying feelings as Naruto, now a girl, grows up under his guidance. And Shikamaru is also a character that is sometimes paired with 'Naruto reborn as a girl' because of their friendship and how Shikamaru might see her in a new way and develop feelings for her over time.
Often, a young and brave hero might be paired with Lady Black. This hero could be someone who is still learning about their powers and looks up to Lady Black for guidance.
In some Black Queen fanfiction, the Prince of Shadows is frequently paired with her. Their relationship can be complex, perhaps they are rivals at first but then find common ground. There's also the Enchantress. Since both are female characters with great power, their interactions can range from intense competition to unexpected alliances. And don't forget the Lone Wanderer, who might be drawn into the Black Queen's orbit and become an important part of her story.
One character often paired with Tyrian could be Cinder. Since they are both villains in RWBY, they might be grouped together in fanfiction to carry out some devious plans. Their combined powers and personalities can create some interesting dynamics.
Princess Peach is often paired with Dark Mario in fanfiction. Their relationship can be very different from the normal one. Instead of being the damsel in distress, Peach might be a more complex character, perhaps even having a dark side herself and being in a sort of power struggle with Dark Mario. Another character is Luigi. He could be either trying to save his brother from the darkness or be in direct conflict with Dark Mario as he tries to protect the Mushroom Kingdom.