One interesting aspect could be the exploration of Sabo's emotions. He has a deep connection to both Ace and Luffy. In the fanfiction, it might show how he misses Ace and his unwavering loyalty to Luffy. For example, it could describe his memories of their adventures together as kids, which would be really nostalgic.
One key event could be Sabo remembering the day they all made their vow to become pirates. It's a really important moment for their brotherhood. Another might be when Sabo recalls a dangerous adventure they had where Ace and Luffy showed great courage.
Well, there are fanfictions that explore their emotional bonds. For example, a story where Luffy gets seriously injured during a fight and Ace and Sabo have to work together to save him. This would not only show their physical strength but also their deep love and loyalty for each other as brothers. And some fanfictions might also involve them facing a powerful new enemy together that forces them to rely on their unique skills and the power of their brotherhood.
One great 'Ace Sabo Luffy Fanfiction' is 'The Brothers' Bond'. It beautifully explores their relationship, showing how they support each other through various challenges. Another one is 'Sabo's Return'. It focuses on Sabo coming back into Luffy and Ace's lives and how they all readjust. There's also 'Ace and Luffy's Adventure', which takes the three on a fictional journey filled with action and heartwarming moments.
One common theme is their brotherly bond. Writers often explore how their relationship grew and how it affects their adventures. For example, a fanfiction might show how they support each other during tough battles.
A plot could revolve around a tournament on an island. Ace, Sabo, Luffy, and members of Whitebeard's crew participate. The prize is a powerful devil fruit. Each character has their own reasons for wanting it. As the tournament progresses, old rivalries are rekindled, new friendships are formed, and they all discover more about themselves and their place in the pirate world.
Well, one possible future for them in Marine fanfiction could be that they form a special unit. Ace with his fire power, Luffy with his rubber abilities and Sabo with his skills would be a formidable team. They could be sent on special missions to deal with the toughest pirates. This way, they are still following their dreams of adventure while being part of the Marines.
Well, it could be that in certain fanfictions, the writers are trying to explore 'what - if' scenarios where Ace and Sabo have some sort of falling out with Luffy. It might be because of jealousy, perhaps they think Luffy is getting more attention or something. But really, this is a huge departure from their normal loving relationship in the main One Piece story.
In fanfiction, a recurring storyline is the Marines' attempts to undermine the brotherly bond of Luffy, Ace, and Sabo. They might try to spread false rumors or create misunderstandings between them. Another popular one is the story of a Marine defector who joins Luffy's crew after realizing the corruption within the Marine ranks. Also, there are stories that focus on the power - up of Luffy, Ace, and Sabo in relation to the Marines. For example, they might gain new abilities and then use them to outwit the Marines in a big battle. There could also be fanfictions that explore the emotional side of the Marines, like a Marine who feels guilty for having to fight against the brothers because he secretly admires their loyalty to each other.
Rediscovery of their relationship after separation can be a theme as well. Given their backstories in One Piece where they were separated at times, in the fanfictions, their reunion can be the starting point of a new, more romantic relationship.
In some fanfictions, character corruption can be a factor. The author might decide to corrupt the pure relationships in the original story. So Ace and Sabo are written as hating Luffy because they are influenced by some external dark force or bad ideology within the fan - created universe.