Well, in the 'big mom is luffy's mom fanfic', they might have crafted a story where Big Mom is Luffy's mom. But it goes against what we know from the official 'One Piece' story. Fanfictions like this can be really interesting as they can rewrite the story in unexpected ways. They might have some interesting plot twists and explanations within the fanfic to justify this relationship, but it's not part of the main 'One Piece' universe.
One possible plot implication could be a change in Luffy's power source. Since Big Mom has such unique and powerful abilities, Luffy might inherit or be related to some of those powers in the fanfic. Maybe his Devil Fruit ability could be related to Big Mom's in some way.
Big Mom herself is often a central and popular character. Her immense power and unpredictable nature make for interesting storylines. Writers can explore her relationships with her children and how she rules the crew.
One interesting story could be about a new crew member joining the Big Mom Pirates. They might face challenges in adapting to the strict hierarchy and unique rules of the crew. For example, they have to deal with Big Mom's mood swings and the various powerful members already in the crew.
To write an engaging Big Mom Pirates self - insert fanfic, first, really study the characters in the Big Mom Pirates. Know their personalities, goals, and relationships. For example, Big Mom herself is a complex character with a huge appetite and a strict family structure. Then, think about how your self - inserted character would fit into this world. Maybe your character has a special ability that can either help or challenge the pirates. Also, create interesting plotlines. It could be about a treasure hunt with the pirates or getting involved in their internal power struggles.
One common trope is the underdog story. Your self - inserted character is often new and not very powerful at first compared to the established Big Mom Pirates. They then have to prove themselves. Another trope is the discovery of a hidden power or ability within the self - inserted character. It could be unlocked during a dangerous encounter with the pirates. And there's also the 'fish - out - of - water' trope, as the character is usually from a different background and has to adjust to the strange and often brutal world of the Big Mom Pirates.
In 'luffy vs kaido fanfiction', Luffy's growth and new abilities are often explored. He might develop new forms of his Gear powers to face Kaido. Kaido, being extremely powerful, forces Luffy to push his limits. Fanfictions may also focus on the intense battle scenes, with detailed descriptions of their attacks and counter - attacks.
Fem Luffy would probably bring a lot of energy. She might be more empathetic in some ways compared to the original Luffy, which could help in resolving internal crew conflicts. For example, if two crewmates have a disagreement, she could use her charm and understanding to smooth things over.
Well, perhaps there will be some epic battles. Luffy's crew, the Straw Hats, could face off against some of the Whitebeard Pirates in a friendly spar. Luffy might use his Gear Second or Gear Third to show off his power, while the Whitebeard Pirates display their own unique combat skills. And in the end, they could gain a mutual respect for each other.