One common character paired with 'female Luffy' is Zoro. In some fanfictions, their relationship could be more of a romantic nature. Zoro might be the first one to notice the changes in Luffy when she reveals her female side, and then they start to develop a deeper connection. Their dynamic would be different from the original, with more of a romantic tension added to their usual banter.
Sanji is also often paired with 'female Luffy'. Given Sanji's love for women, his reaction to a female Luffy would be quite extreme. He might go overboard in trying to protect her and court her. The fanfiction could explore how Luffy deals with Sanji's over - the - top behavior while still maintaining her role as the captain. It would be a comical and interesting relationship to write about.
Nami could also be a common character. She might help Luffy manage the financial aspects of his admiral duties, as well as use her navigation skills to assist in any navy - related voyages. And of course, she'd be there to keep Luffy in check when he gets too carried away.
Some fanfictions also pair Luffy with Hancock. Given Hancock's infatuation with Luffy in the original series, it's not a stretch to develop a full - blown love story. Her powerful status as a pirate empress and Luffy's carefree nature can create an interesting dynamic, with Hancock trying to win Luffy's heart while he is mostly oblivious to her romantic intentions.
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.
Stan can also be paired with Kenny. Stan's more moral - centered character can contrast with Kenny's somewhat nihilistic view of his own mortality. In a crossover with a post - apocalyptic world, Stan might be trying to find a way to save humanity while Kenny is just along for the ride, but still manages to survive in the most unexpected ways.
Cheelai and Lemo from the Broly movie might also be paired with the reincarnated Broly. They could act as his guides or friends in the new world he finds himself in, helping him navigate the complex politics and power dynamics of the Dragon Ball universe.
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.
Natsu is often paired with Lucy. Their chemistry in the original series makes it a popular choice in fanfiction. Gray might also be paired with her in some stories, as their interactions can be explored in a more adult way.
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.
Often, Midoriya is paired with Mineta in time travel fanfiction. Their contrasting personalities can create interesting dynamics. Midoriya's determined and heroic nature can either inspire Mineta to be better or clash with his more self - interested ways.