Yes, there are some out there. You can start by looking on fanfiction websites like Archive of Our Own or FanFiction.net. Just search for 'Luffy x Female Shichibukai' and you'll likely find a variety of stories with different takes on their relationship.
One popular theme is the idea of redemption. Maybe the female Shichibukai has a dark past and Luffy helps her to see a different way. Another theme could be power - sharing. They might combine their unique abilities to overcome a great threat.
One common theme is adventure. Since they are pirates, stories often revolve around them going on quests and facing challenges together. Another theme is loyalty. Zoro's loyalty to Luffy is a big part of their relationship in the original series, and this is carried over and sometimes even deepened in fanfictions.
A fanfiction named 'Zoro and Luffy's Unusual Alliance' is quite good. It starts with a situation where the crew is in a big trouble. Female Luffy's leadership and Zoro's unwavering loyalty create an interesting dynamic. The story is full of action and also some really heart - warming moments between the two characters as they rely on each other to get through difficulties.
There are indeed. Some fanfictions might focus on their adventures together in a new storyline that deviates from the original manga. Others could explore their relationship in a more emotional and character - development - centric way. It really depends on what you're interested in.
One common theme is adventure. They might go on new quests together. Another could be friendship that slowly develops into something more. And sometimes, there's the theme of protecting each other in dangerous situations.
Perhaps there could be a plot where an evil force is threatening both the ninja world and the pirate world. Female Luffy and Naruto are chosen as representatives of their worlds to form an alliance. They have to combine their skills, with Naruto's ninjutsu and female Luffy's Gum - Gum powers. As they travel together, they also develop a deep friendship, and the story could explore how their different cultures and values interact and influence each other.
Adventure is also a big theme. They are both characters from One Piece, a world full of adventures. So in these fanfictions, they might go on new and exciting adventures together. For example, they could discover a new island or face a new powerful enemy. And their relationship would develop during these adventures. Maybe female Luffy would show different leadership skills compared to the original, which would affect how they deal with the challenges on their adventures.
One common theme could be adventure. Since One Piece is all about adventure, the fanfictions might continue that trend with female Luffy and male Nami going on new and exciting quests together.
One good fanfiction could be 'The Unlikely Alliance'. In this story, female Luffy and Law team up in a really unique way. Their personalities clash at first but then they start to understand each other more. It has some great action scenes and also shows their relationship developing in a very interesting way.