I recommend 'The Legend of Celestial Immortals'. The main character of the novel, Mo Xian, traveled to the Firmament World and became an outer disciple. He loved farming. While the various big shots were fighting over the Ginseng Fruit and Lingzhi, Mo Xian was using these precious spiritual medicines to feed sheep or rice. In the end, through their unintentional actions, all the important figures came over to beg Mo Xian to exchange for the spirit herbs. If you're interested in this novel, you're welcome to read it. I hope you'll like this fairy's recommendation.
If Luffy ate a different devil fruit, his entire power set and character would change drastically. For example, if he ate a Logia type like the Smoke - Smoke Fruit, his fighting style would be more about evasion and stealth. He could turn into smoke to avoid attacks, and his stretching abilities would be gone. His crew might also have to adjust their battle strategies around his new powers.
The uniqueness of 'no devil fruit Luffy fanfiction' lies in the fact that it challenges the traditional view of Luffy. Without his devil fruit powers, Luffy has to rely on his other qualities like his determination, his Haki, and his physical combat skills. It's interesting to see how he overcomes challenges in a different way.
In some fanfictions, Luffy's Devil Fruit is indeed considered the strongest. His Gum - Gum Fruit gives him unique abilities like stretching his body in incredible ways. In fan - created stories, these abilities can be enhanced even further, making him almost unbeatable.
However, in the world of One Piece, it's been said that eating two devil fruits would cause a person to explode. But in fanfiction, this rule might be bent. Another consequence could be that Luffy's personality changes. The new devil fruit power might come with some sort of consciousness or influence that alters his decision - making or how he views the world. He might become more aggressive or more cautious depending on the nature of the new power.
Imagine Luffy ate a devil fruit that gave him the power to control minds. This would be a very different power compared to his current Gum - Gum abilities. His crew would have to trust him completely not to abuse this power. There could be ethical discussions within the crew. Also, in terms of leadership, Luffy might have an easier time getting others to follow his plans, but it could also create some tension if the crew felt he was relying too much on his mind - control powers instead of his natural leadership qualities.
Marshal Sengoku of One Piece ate the Rock Fruit. This fruit could turn him into a stone man who was immune to physical attacks and had a certain defense and weight.
One interesting luffy dragon fruit fanfiction could be about Luffy discovering a new type of dragon fruit that gives him the power to control time. He then uses this power to go back and prevent some of the tragedies that happened to his crew. This would add a whole new layer of depth to his character and the story.
One of the main things that make it strong in fanfiction is the creative use of its basic properties. Writers can make Luffy use his stretching in ways that are not shown in the original manga or anime. He could stretch his internal organs to survive otherwise fatal blows. Or he could use his stretched body to create complex structures for defense or to launch multi - directional attacks. This freedom of creativity in fanfiction enhances the perceived strength of his Devil Fruit.