Zoro is also sometimes paired with Baby 5 in fanfiction. Zoro's strong and stoic personality is a contrast to Baby 5's more emotional and compliant nature. Fanfiction writers might explore how they could influence each other. Maybe Baby 5 helps Zoro open up more emotionally while Zoro teaches her to be more self - reliant.
Well, Sasuke can be one of the characters paired with baby Kurama in fanfiction. It could be an interesting dynamic as Sasuke is usually more aloof, and seeing how he reacts to a baby Kurama can create an engaging story. Also, Kakashi is a common choice. His calm and experienced nature would contrast with the baby Kurama's naivete and inquisitiveness. He could be in a role of mentoring or protecting the baby Kurama in these stories.
In a number of Ace Lives fanfictions, Ace is paired with Hancock. Hancock has a strong personality, and her interactions with Ace can be full of drama and interesting developments. Maybe Ace needs Hancock's help for some reason related to his survival or his new goals, and this leads to a unique relationship between them. There are also fanfictions that explore Ace's relationship with Shanks, especially if Ace's survival has implications for the overall power structure in the pirate world that Shanks is also a part of.
Some fanfiction also pairs Law with Kid. Given that they are both Supernovas and have a somewhat competitive relationship in the main story, in fanfiction, they could end up as reluctant allies or even friends. Their combined strength and different personalities can create interesting storylines.
Optimus Prime is sometimes paired with baby Soundwave. Their interactions can be really interesting as they come from opposite sides. Optimus might take on a mentor - like role towards baby Soundwave, teaching him about things like morality and the value of life.
One of the most common characters paired with baby Link in fanfiction is Midna. Midna has a complex personality and in a fanfic, she could be intrigued by baby Link. She might be a bit of a trickster around him at first but then grow to care for him deeply. Another character is Ruto. Ruto could see baby Link as a future hero and form a special bond with him early on. She might give him small gifts like a precious stone from the Zora's domain. And of course, Link's own family members, if they are included in the fanfiction, would be very common characters paired with him. They could pass down family traditions and stories to baby Link.
Madara is quite commonly paired with Hashirama in crossover fanfiction. Their complex relationship in the original Naruto series makes for interesting scenarios when they are placed in different crossover settings. They could be forced to work together against a new threat or their rivalry could take on new dimensions in a different world.
Sasuke is very commonly paired with 'Naruto as a girl' in fanfiction. Their relationship has a lot of potential for romantic development when Naruto is a girl. There's the whole dynamic of their rivalry and the underlying feelings that could be explored in a different way. Another common pairing is with Kakashi. Kakashi could be a mentor figure but also potentially have a different kind of relationship with a female Naruto, perhaps more protective or having a special bond.
Gwen Tennyson is often paired with Ben 10000. Since they are related in the original series, it's interesting to see how their relationship might be different in a crossover scenario. Maybe they have to work together to save the universe in a more complex way than before.
Erza is also frequently paired with Edolas Lucy. Erza's strong leadership and sense of justice can influence Edolas Lucy in many ways. And the relationship can be developed in different directions, such as a mentorship kind of relationship or a deep friendship where they support each other through various challenges in the fan - created stories.
Nightwing is often paired with Batgirl. They have a history together, and in crossover fanfiction, they can have some great team - up moments. Whether it's fighting crime in Blüdhaven or Gotham, their combined skills are quite formidable. Also, Harley Quinn is a popular character to pair with Batgirl. Their interactions can range from comical to intense, as they have very different personalities but can find common ground in certain situations.