jinbei is not afraid of big mom

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.

I'm not a person to be afraid in a Naruto fanfic, but generally, characters might be afraid of a 'big bad wolf' - like figure if it represents a great threat. In Naruto fanfic, it could be a new, powerful and malevolent villain that shares some characteristics of a big bad wolf, such as being predatory and dangerous. But it really depends on the specific plot and how the author writes it.

I'm not sure. Maybe it depends on the person's reading preferences or past experiences with similar stories.

Often, in such stories, it's the characters who are smaller and weaker, like little lambs or ducklings. They fear the wolf's strength and might.

It could be a character who is intimidated by the power or content of the book within the online story.

I'm not afraid. In Naruto fanfic, the big bad wolf might just be a symbol or a plot device rather than something truly terrifying.

Yes, Jinbei does join the Straw Hats in the manga.

Jinbei doesn't die in the One Piece manga. The manga keeps him as an active and significant character, contributing to the adventures and battles.

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.

It's hard to say for sure. It might be a villain who fears the power or knowledge the book holds and sees it as a threat to their plans. Or it could even be a magical creature that's been warned about the book's dangers.