In a Mihawk x Boa fanfiction, the plot could revolve around a mission. Let's say the World Government tasks Mihawk with keeping an eye on Boa because they suspect she might be planning something against them. Mihawk, being the stoic character he is, accepts the mission. Boa, on the other hand, quickly realizes she is being watched. At first, she tries to get rid of Mihawk, but he proves to be a difficult adversary. As time passes, they start to understand each other's motives. Boa's reasons for her actions might be related to protecting her island and people, and Mihawk might start to respect her for that. This could lead to a change in their relationship from one of animosity to mutual understanding and maybe even love.
Mihawk's personality is centered around his dedication to the art of the sword and his self - imposed isolation. Boa has a personality that is a mix of vanity (due to her beauty) and a strong sense of leadership for her people. Their personalities could clash when it comes to decision - making. Boa might be used to making quick decisions based on her intuition and her position of power, while Mihawk would analyze every situation thoroughly. However, this difference could also be a strength. Boa could introduce Mihawk to the concept of relying on intuition sometimes, and Mihawk could teach Boa the importance of patience and in - depth analysis. This could lead to a very interesting dynamic in their relationship in the fanfiction.
One idea could be that they team up to face a new, extremely powerful enemy that threatens the balance of the New World. This enemy could be a former Rocks Pirate member who was in hiding and now has a plan to take over. Shanks and Mihawk, despite their differences, realize they need to combine their skills.
Well, in such fanfictions, the relationship might start off with the reader being in awe of Mihawk's strength. For example, they could meet on an island, and the reader is immediately drawn to his presence. As the story progresses, a bond might form, perhaps through some shared adventures or the reader getting caught up in Mihawk's world of swordsmanship and power.
One popular theme is the power imbalance. Mihawk is extremely powerful, and the reader character is usually much weaker. This creates an interesting dynamic where the reader might look up to Mihawk and strive to become stronger. Another theme could be the exploration of Mihawk's backstory through the eyes of the reader.
Zoro would be an obvious choice. Since Zoro has always aspired to defeat Mihawk, a crossover could show them in a situation where they have to put aside their rivalry and fight together. It could be a great opportunity to explore their relationship further and how they might learn from each other in combat.
One possible plot idea could be that she discovers she's pregnant during a time of great turmoil in the One Piece world. Maybe she has to hide it at first to protect herself and the unborn child from her enemies. As the story progresses, she might start to consider how motherhood will change her role as a Shichibukai and her relationship with Luffy and the Straw Hats.
One idea could be Mihawk getting transported to a different part of the One Piece world where he has to team up with the Straw Hats to face a new and powerful enemy. Maybe a group of ancient sea gods that are awakened and threatening to destroy all pirates. The Straw Hats could initially be wary of Mihawk but soon realize his skills are crucial for their survival.
A plot could revolve around Perona trying to cheer up Mihawk. Since he is often portrayed as a rather stoic and solitary figure. Perona could use her unique personality and ghostly antics to bring some unexpected humor and light into Mihawk's life. For example, she could create ghosts that re - enact funny scenes from Mihawk's past battles, which at first he is annoyed by but then starts to find amusing.
Perhaps in this fanfiction, Naruto is on a mission in his own world when a strange portal opens and leads him to the One Piece universe right where Robin is. At first, they are both cautious of each other. But as they learn about their respective powers and goals, they decide to join forces. Maybe there's a common enemy that is threatening both the ninja world and the pirate world, and together they strive to defeat it.
Another option could be a new character introduced specifically for the fanfiction. This character could be a powerful pirate or a mysterious figure from Hancock's past. He might have a connection to Hancock's family or her position as a Shichibukai. His presence would add an element of mystery and new dynamics to the story, especially in relation to the pregnancy.