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.
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.
A fanfic could explore a world where Suiryu and Garou are from different dimensions. They meet by chance and have to figure out how to get back to their respective worlds while also dealing with their own personal growth and the challenges that come with their encounter.
Yes, there might be. The Naruto and One - Punch Man fandoms are both large, and it's not uncommon for fans to create crossover fanfics. In such a fanfic, Naruto could be depicted as a fan of Garou for various reasons, like being impressed by his fighting style.
One idea could be a story where Garou and Metal Bat are forced to team up against a common enemy stronger than they've ever faced. They start off hating each other but gradually learn to respect each other's fighting styles.
There is also 'Metal and Fang'. In this fanfic, it focuses on how Metal Bat and Garou start off as rivals but gradually come to understand each other's motives. It's quite interesting as it delves deep into their personalities and how they might interact in different situations.
First, develop a strong character for your oc. Give her more than just the physical trait of being big - breasted. A good backstory, unique personality traits, and goals are important. For example, she could be a powerful fighter despite some initial insecurities related to her appearance.