Well, I'm not sure about a specific 'Naruto brother of Meliodas' fanfiction that stands out above all others. It really depends on what you're looking for in a fanfic. If you like action - packed stories, you might find some that incorporate Naruto's ninja skills and Meliodas' demon powers in interesting ways. But you'll have to dig through the available fanfics to find the ones that suit your taste.
There are also 'meliodas fanfic' stories that center around his relationship with Elizabeth. They might create different scenarios for their love story, like how they meet in alternate universes or how they overcome new challenges together.
One common theme could be the power struggle. Given that both Naruto and Meliodas are powerful in their own right, as brothers, they might face challenges related to controlling or using their powers together. Another theme could be loyalty, showing how they support each other through difficult times.
If Naruto had Meliodas' power in a fanfiction, he would become extremely powerful. Meliodas' power includes things like his superhuman strength, speed, and his ability to use the Demon powers. Naruto could use this to enhance his own ninja skills. For example, his Rasengan could be charged with Meliodas' demonic energy, making it much more destructive. He might also be able to use some of Meliodas' sword skills in combat, giving him an edge against tough opponents like Sasuke or Madara.
One interesting plot could be two Narutos from different timelines meeting. They could exchange stories about their battles and growth, and then team up to face a new, powerful enemy that neither could defeat alone.
Well, obviously Naruto himself would be the main character. There could also be his friends like Sasuke and Sakura, who might be involved in the interactions between the two Narutos. Maybe they are confused at first by seeing two Narutos, but then they help them figure out what's going on.
Create an interesting plot. It could be a continuation of the existing story, a 'what - if' scenario, or a completely new adventure for Meliodas. For example, you could write about what would happen if he lost his powers for a while and how he would cope.
Well, in a fanfic where adult Naruto meets kid Naruto, it could be really interesting. Adult Naruto might be super proud of his younger self. He could give kid Naruto some tips on how to train better and how to deal with the loneliness he sometimes feels. Maybe he'd also tell him some spoilers about future events in a fun, teasing way.
Another character that could be important is Jiraiya. Since he was Minato's teacher and Naruto's mentor, he could play a role in the fanfic. Maybe he helps facilitate the meeting between Minato and Naruto, or he has some words of wisdom for both of them during their time together.
One possible plot could be that Naruto, in his journey, stumbles upon a succubus. The succubus might initially be attracted to Naruto's strong chakra. She could try to use her powers on him, but Naruto, being Naruto, resists with his determination. Maybe he tries to understand her instead of immediately fighting, leading to an unlikely friendship.