Well, perhaps fem Harry travels through different dimensions and lands in the world of One Piece. There, she meets Monkey D. Dragon and they form a relationship. As Luffy's mother, she could have a major influence on his values. She might pass on her sense of justice and determination, which are traits she has from her own story in the Harry Potter universe. The plot could also involve her using her knowledge of magic (or a magical - like power in the One Piece world) to help Luffy's crew during their various challenges. For example, she could help them escape from a powerful enemy's trap by creating some sort of magical diversion. Also, she could be the one who gives Luffy a special item that has magical properties and aids him in his journey to become the Pirate King.
There could be. Fanfiction is a place where all kinds of wild and creative ideas come to life. The idea of fem Harry being Luffy's mother is quite unique and would attract a lot of readers who are into crossovers. Some fanfic writers love to blend different universes together, and this would be a really interesting blend. But finding it might take some time. You should look for fanfics that deal with character relationships in an unconventional way and also check for any tags related to gender - bended characters from the Harry Potter series in the context of One Piece.
The plot might involve Fem Harry using her unique skills and experiences as a wizard to raise her four kids in a magical world. For example, she could be teaching them magic in a very different way compared to traditional wizarding families. Also, it could show how she manages relationships with other characters in the fanfiction world while being a mother of four.
She could be a former pirate captain herself. Maybe she was one of the most feared pirates in her time, and her skills and reputation were passed down to Luffy in some way, even if he didn't know it was from his mother.
There could be an original character created just for the fanfiction. A woman with a kind heart but a tough exterior, who was a great fighter. She could have met Luffy's father during a battle and they fell in love, and she became Luffy's mother.
Well, one possibility could be that Luffy's mother was a celestial dragon who rebelled against their cruel ways. She might have fallen in love with Luffy's father during her journey of self - discovery away from the celestial dragon lifestyle. And then she had to protect Luffy from the wrath of the other celestial dragons as he grew up with his dreams of freedom.
In this fanfiction, it could be that Luffy's mother was thought to be dead but was actually held captive by a powerful enemy. When Luffy finally meets her, she's weak but still full of spirit. She encourages Luffy to keep fighting against the corrupt world of pirates and marines alike. She might also have some inside information about the One Piece, like a clue that she's been holding onto all these years, which sets Luffy on a new and exciting part of his adventure.
Well, it could be possible if we consider a complete rewrite of the timelines and rules of both universes. In this fanfiction scenario, Fem Harry might have her own set of skills and personality traits that attract a character in Naruto's world. For example, her bravery and determination could be seen as very appealing. And then, through a series of events like falling in love, getting married, she could become Naruto's mother. It would be a really unique and creative concept.
Hermione would likely be a strong ally. She's always been Harry's friend and is smart and resourceful. In this scenario, she could help fem Harry with spells and strategies to keep her and her child safe.
One possible plot could be that fem Naruto's mother discovers Kurenai has a special ability that could help save the village. So, she convinces Kurenai to use it, despite Kurenai's initial reluctance.
One common theme is the clash and blend of different worlds. Harry comes from a world of magic, and Luffy from a world of pirates. So, there's often a theme of adaptation as fem Harry has to get used to the pirate lifestyle, the open seas, and the different values of the One Piece world.