I think 'Naruto: The Elemental Master' is a top - notch fanfic. Here, Naruto gains control over all the elements in a very unique way, which sets him apart from his canon self. The story has great pacing and the fight scenes are beautifully written. 'Naruto: Reborn as a Jinchuriki' is another good one. It gives Naruto a new perspective as he is reborn with the knowledge of his previous life. And 'The Legendary Naruto' is a fanfic that really amps up Naruto's badassery. It has him facing god - like enemies and coming out victorious through his sheer will and newfound powers.
A really beginner - friendly fanfic is 'Naruto and the Lost Puppy'. It has a simple plot about Naruto finding a lost puppy and going on a small adventure to return it. It's cute and shows Naruto's kind heart. 'Naruto's First Mission Mishap' is also a good choice. It's about Naruto's first real mission going wrong in a humorous way. And 'The New Ninja in Town' is a fanfic that introduces new characters along with Naruto in a way that's easy to understand for those new to 'Naruto' fanfics.
One of the most interesting characters could be a new character created specifically for the fanfiction with a unique bloodline ability, like the power to create illusions so real that they can physically harm opponents. Another interesting character could be an existing character from the Naruto series whose bloodline is explored in more depth, such as Rock Lee if he were to have a secret bloodline that enhances his taijutsu in unexpected ways. And there's also the possibility of a villainous character with a bloodline that gives them the ability to steal other people's chakra.
In the Chunin Exams, Gaara was extremely badass. He had that menacing presence and his sand powers were really something. Temari too was not to be underestimated. Her wind - based attacks were powerful. Shikamaru, though not the most physically powerful, was badass in his own way. His strategic mind helped him outwit his opponents, like in his fight with Temari.
One could be John McClane from 'Die Hard'. He's tough, resourceful and faces numerous dangerous situations alone. Another is Sherlock Holmes. His brilliant mind and fearless attitude in solving complex cases make him badass. And then there's Aragorn from 'The Lord of the Rings'. He's a fearless leader and a great warrior.
The story of the 300 Spartans at Thermopylae is very memorable. They knew they were facing a huge Persian army but didn't back down. They fought with such ferocity that they held the pass for days. Another memorable one is the story of the Tuskegee Airmen in World War II. These African - American pilots had to face discrimination at home but still fought bravely in the skies over Europe, shooting down numerous enemy planes and proving their worth as pilots.
Naruto can fit in as a badass in Fairy Tail fanfiction by being a powerful combatant. His ninja skills are on par with the powerful mages in Fairy Tail. For example, his speed and agility can match up to the likes of Erza in battle. His rasengan is a powerful attack that could be compared to some of the more destructive magic spells in the Fairy Tail universe.
One popular 'badass naruto harem fanfiction' is 'Naruto: The Harem King'. It shows Naruto in a more powerful and charismatic light while building his harem in an interesting way. The story has great character development for not only Naruto but also the girls in his harem.
In the Naruto x harem fanfiction, Naruto is a badass because of his combination of raw strength, strategic thinking, and his heart of a hero. He's not afraid to go against the odds and always finds a way to come out on top for himself and his harem.
Batman himself is obviously one of the most popular characters. He is the central figure and the source of the 'badass' factor in the fanfic. The Joker is also very popular as he provides a great contrast to Batman with his chaos and madness. Harley Quinn is often included as well, with her complex relationship with the Joker and her own brand of insanity. Another popular character is Robin, who represents the sidekick and the future of Batman's legacy.