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.
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.
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.
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.
Another good choice is 'Friendship Beyond the Village'. It focuses on Naruto's relationships in a friendly and accessible way. The writing style is clear, and it shows the essence of Naruto's character quite well.
In some fanfictions, Snape has badass moments when he outsmarts Voldemort. For example, he manages to mislead Voldemort about the location of a crucial magical artifact. He uses his Occlumency skills to his advantage, hiding his true thoughts and intentions while presenting false information in a very clever way. This not only shows his intelligence but also his courage as he risks his life to deceive the Dark Lord.
He becomes more aloof. Instead of being the overly friendly Naruto, he might be more reserved. For example, he won't immediately trust people like he used to.
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.
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.
Another theme is the idea of revenge. If Naruto has been wronged in some way in the fanfiction, he might turn evil and badass as he seeks revenge on those who have hurt him. This could lead to some intense and dark storylines where he goes up against his former friends and allies.
Well, for one, seeing Naruto as a badass is always cool. It's a different take on his character. And the harem aspect adds an element of romance and relationship drama. For example, in some fanfictions, Naruto has to balance his ninja duties with the feelings of the girls in his harem, which makes for an interesting plot.