One of the main themes is family. Ace's search for his place in the world, considering his complex family background with Gol D. Roger as his father. This theme is often explored in light novels related to him.
One well - known Portgas D Ace - related light novel is 'One Piece Novel A'. It delves deeper into the world of One Piece and provides more backstory about Ace. It has great character development and interesting plotlines related to his adventures.
There's also 'Naruto and Ace: Cross - World Bonds'. This fanfiction focuses on the friendship that develops between Naruto and Ace when they meet in a strange in - between world. It delves deep into their personalities and how they learn from each other. For example, Naruto teaches Ace about the importance of having a strong will in a different way than what Ace is used to in the One Piece world.
A good Naruto and Portgas D. Ace fanfiction often has a well - thought - out plot that combines the elements of both universes in a believable way. For instance, how the chakra system in Naruto might interact with the devil fruits in One Piece.
One great 'portgas d ace crossover fanfiction' is 'Ace in Another World'. It has an interesting plot where Ace is transported to a different universe and has to adapt. The story does a wonderful job of maintaining Ace's character while introducing new and exciting elements.
One unique feature is the blend of different universes. For example, Ace might be put into a world with different magic systems or technology levels. This creates a whole new set of challenges and opportunities for his character.
One possible plot could be Ace, now female, joining the Whitebeard Pirates in a different way. Maybe she has to prove herself even more as a female in the male - dominated pirate world. She could face unique challenges and form different relationships with the crew members, like having a more sisterly bond with some of the younger pirates.
One common theme is adventure. Since Ace is a pirate in One Piece, many fanfictions incorporate the reader into his exciting adventures on the high seas. They might go on treasure hunts or battle against other pirates together.
Physically, she would of course look different. But more than that, her personality might become more nurturing. While Ace was always a loyal and brave character, as a female, she might show her loyalty and bravery in a more empathetic way. For example, she could be more in tune with the emotions of the crew and offer more emotional support.
You can try fanfiction websites like Archive of Our Own (AO3). There are a large number of Portgas D Ace x Reader fanfictions on it. You can search by tags to find the ones that suit your taste, such as 'romance' or 'adventure' tags.