It could be about exploring a different love story within the 'Book of Life' universe. Maybe a character that was a side character in the original gets a full-fledged romance in the fanfiction.
It might also be centered around a character's backstory that wasn't fully explored in the 'Book of Life'. Say, Adelita Cousins could expand on a character's childhood and how it shaped their actions in the main story of the 'Book of Life' in this fanfiction.
The main characters would probably be the ones from the original 'Book of Life' like Manolo, Maria, and Joaquin. Since it's a fanfiction, Adelita Cousins might give more focus on one of them and their personal journey.
In the fanfiction, they could both have different dreams. Tony might want to be an artist while Sharon wants to be a scientist. Despite their different paths, they encourage each other. They also deal with family expectations as cousins and find ways to support each other's dreams without sacrificing their family relationship.
In a fanfiction where Naruto is in the Bingo Book, it could mean that the ninja world's perception of him has drastically changed. Maybe he's been framed for a serious crime he didn't commit. This would lead to him trying to clear his name while also avoiding those who are after the bounty on his head. He'd have to rely on his friends more than ever, and there would be a lot of tension between him and the ninja villages that are now after him.
Well, one possibility could be that Naruto has some sort of hidden power or ability that the bingo book writers discovered and added him secretly. Maybe it's a power he doesn't even know he has yet. It could lead to all sorts of interesting situations like other ninjas being sent to hunt him down without him fully understanding why.
A plot could revolve around Naruto and Nagato growing up together. Since they are cousins, they would have a natural connection. Nagato's experiences in the past might make him more cynical compared to Naruto. However, Naruto's unwavering belief in peace could start to influence Nagato. They could go on a journey to understand more about their family roots, and during this journey, they face various challenges that test their relationship and their own beliefs. Along the way, they might encounter characters who knew their family members and gain more insights into their family history. This could lead to a change in Nagato's perspective and ultimately, they could strive towards a common goal of bringing peace to their world.
One possible plot could be Percy waking up one day and finding himself back at the start of his journey at Camp Half - Blood, but with all his memories intact. He could then use this knowledge to avoid the mistakes he made before, like getting in unnecessary fights with some of the other campers. He might also try to befriend some characters earlier who he didn't get to know well in the original story.
Perhaps in this fanfiction, Naruto's life is ruled by some game - like rules. For example, he has a certain number of 'lives' and if he fails in a mission, he loses one. He might also earn points for successful missions which he can use to unlock new jutsus or abilities. It could also involve some sort of a game - like ranking system among the ninja community.
One plot line might be that Naruto has a secret mission to protect a sacred object that has been hidden from the ninja world. This object could hold the key to some great power or knowledge. He has to keep it a secret from everyone, including his friends, and this creates a lot of internal conflict as he struggles to balance his loyalty to his friends and his duty to protect the object.
One possible plot could be that America and Maxon face the challenges of ruling their kingdom together. They might have to deal with political unrest and try to bring about reforms. For example, America could start a program to improve education for the lower classes, while Maxon focuses on diplomatic relations. Along the way, they also grow closer as a couple, sharing intimate moments and supporting each other through tough decisions.
Maybe in the fanfiction, Harry discovers some dark secrets about his past that make him question his whole existence and purpose. Like if he finds out that his parents' sacrifice was part of some bigger, more sinister plan, he could become so disillusioned that he gives up on life. He might think that everything he has been through was a lie and there's no point in going on.