Nami would be a great character to include as she has a deep - rooted history with Arlong. Their interactions can add a lot of drama and emotion to the story. Luffy is also a good choice as he is the main protagonist and his values of freedom and justice would contrast sharply with Arlong's tyranny.
One idea could be exploring Arlong's past before he became so cruel. Maybe there was an event that hardened his heart. Another could be a fanfic where Arlong has a change of heart and tries to make amends for his actions. For example, he could start helping the very people he once oppressed.
Arlong's back story starts with the general situation of fish - men in the One Piece world. Fish - men are generally stronger than humans underwater. However, they are not treated equally on land. Arlong witnessed the unfair treatment towards his fellow fish - men. He formed his own group and started to act in a rather extreme way. He took over Nami's village as a form of revenge against the humans. Nami, a talented navigator, was forced to be part of his crew in a sense, drawing maps for him in the hope of one day buying back her village's freedom. His actions were a result of the long - standing discrimination that fish - men had endured, but his methods were definitely not the right way to solve the problem.
Yes, there are likely non - adult fanfictions focusing on their relationship. These might explore their interactions from a more platonic or story - driven perspective. For example, a story could be about how Nami tries to understand Arlong's motives in a more complex way, without any romantic or inappropriate undertones.
One possible plot could be that Arlong, after some self - reflection and a change of heart, tries to make amends with Nami. He could start by helping her protect her village from other threats. This would be a complete turn - around from his previous villainous self, and Nami would be initially very skeptical but gradually come to see the new Arlong.
You can start by looking on fanfiction.net. It has a large collection of One Piece fanfictions, and there's a good chance you'll find some Arlong x OC ones there. Another option is Archive of Our Own (AO3). It's also known for having a wide variety of fan - created works, including this type of fanfiction.
Some interesting Arlong x OC fanfiction include 'Arlong's Rivalry with an OC'. In this, the OC is a powerful fish - man who challenges Arlong's dominance. It's full of action - packed scenes. 'The Enigmatic OC and Arlong' is another. Here, the OC is a mysterious figure who has some sort of connection to Arlong's past. As for 'Arlong's Unforeseen Friendship', the OC is a young girl who accidentally stumbles upon Arlong's lair and what follows is a heartwarming story of how they become friends.
The Warlord's Counterattack: Starting from the Creation of a First-Class Munitions Factory was a novel written by the author, Wang Ci. The story mainly revolved around Zhan Feng and Zhan Yunxiang, telling the story of their adventures and emotional entanglements in Sea City in 1916. The novel was set in the fantasy world of the Republic of China, depicting a world full of surprises and incredulity. Although the specific plot and plot development were not mentioned, based on the information provided, it could be inferred that this novel had a passionate storyline and wonderful descriptions. It was worth reading.
There were many choices for novels that transmigrated into warlords. Among them," Transmigration, Become a Great Warlord " was a fantasy and mysterious fantasy novel written by Fu Yao and Lan Ke. This novel described Zhou Wei's transmigration to a new world and looked forward to his achievements in this vast world. " Green Robe Rebirth " was also a recommended novel. The protagonist was reborn in the body of the green-robed ancestor of the Shu Mountain world and changed the world. There was also " The Rise of Red Cliff in Jingnan ", where the protagonist Liu Xian was reborn as the son of the warlord Liu Du in Jingnan and broke into Cao, Sun, and Liu's families in a different way. These novels all had the theme of becoming a warlord, allowing the readers to experience different adventures and war stories.