Writing a great 'naruto like garou fanfic' is no easy feat. You should start by deciding on the central theme. Is it about redemption like some of Garou's storylines or about achieving a great goal like Naruto? Then, think about the setting. It could be a new world that blends the fantastical elements of Naruto's world with the more gritty and urban feel of Garou's. When creating the characters, give them traits from both Naruto and Garou. For the plot, create a series of challenges that force the characters to use both Naruto - like and Garou - like skills. For instance, they might have to face a moral dilemma like Naruto and then fight their way out of it using Garou's combat skills. Also, don't forget to add some emotional depth to the story, so the readers can really connect with the characters.
In this fanfiction, perhaps Naruto starts to question the concept of 'good' and 'evil' in the ninja world like Garou does in his own story. He could find himself in a gray area, where the actions of his village and the other villages seem less than noble. This could lead to him going on a journey to redefine what it means to be a ninja, while also having some epic battles and character - building moments, just like Garou's journey of self - discovery.
One idea could be a story where a young hero has the determination of Naruto and the combat style of Garou. He could be from a small village that's looked down upon, much like Naruto's Konoha in the beginning. He trains hard, using Naruto - like perseverance and Garou - like fighting instincts to rise through the ranks and prove himself to the world.
For a good character interaction between Garou and Saitama, start with their fundamental differences. Saitama is a hero who is bored with the lack of challenge, while Garou hates heroes. Have them start with a fight, but make it a comical one where Saitama's nonchalance annoys Garou to no end. This can lead to some great dialogue exchanges where Garou tries to taunt Saitama into taking him seriously, but Saitama just doesn't care.
I'm not sure if there is a specific 'naruto is like garou fanfiction' out there. Fanfiction can be found on various websites like Archive of Our Own or FanFiction.net, but you'd have to search specifically for it using relevant keywords in their search bars.
To fight like Taehoon, first, analyze his physical strengths and weaknesses. Then, focus on training the specific skills he uses. Also, pay attention to his mental approach and adopt a similar mindset of determination and focus.
Start with an interesting hook. Maybe it's a sudden appearance of the garou in a world that has no idea what it is. This could create immediate tension and curiosity. Then, gradually introduce the background of the garou as the story progresses. You can also start by creating a profile for your garou character in the context of the crossover. Decide on its personality, goals, and how it will change throughout the story.