There's a fanfic titled 'Garou and Metal Bat: A New Understanding'. In this story, they start off as rivals but as the plot progresses, they realize they have more in common than they thought. It shows their journey from hostility to a sort of friendship, with some great action scenes in between.
A popular 'garou x metal bat fanfic' is 'When Opposites Collide'. It focuses on how their contrasting fighting styles and personalities play out when they are forced to work together. The author does a great job of exploring their individual backstories and how those influence their relationship in the fic.
Character development is a big part of these fanfics. Since both characters have their own fan bases, the writers try to stay true to their original personalities while also adding new layers. For example, Garou's struggle between his anti - hero ways and his potential for good can be further explored in relation to Metal Bat's more straightforward sense of justice. And the action scenes in these fanfics are usually intense, given the combat - ready nature of both Metal Bat and Garou.
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.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfics from various fandoms, and there are likely to be quite a few 'garou x metal bat' ones there. Just use the search function and type in the relevant tags.
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.
One idea could be that they start off as rivals but are forced to team up against a common, even more powerful enemy. As they fight side by side, they gradually gain respect for each other's fighting abilities.
How about a plot twist where Garou suddenly loses his powers. Metal Bat, who has always seen Garou as a powerful adversary, now has to protect him. This forces them to work together in a new way and also makes Metal Bat re - evaluate his perception of Garou.
In the fanfiction, put them in various challenging situations. For example, they are trapped in a maze - like place. Metal Bat has to rely on Garou's survival skills, and Garou has to rely on Metal Bat's brute strength at times. Through these experiences, they both change. Metal Bat becomes more patient and Garou becomes more open to the idea of not being a complete outcast. This way, their characters develop in a natural and engaging way.
Well, the fanfiction could focus on a training arc between them. Imagine Garou, who has his own unique fighting style, teaching Metal Bat some new moves. In return, Metal Bat could teach Garou about the importance of protecting the weak. Their relationship could develop from a mutual dislike to a begrudging respect and then to an actual friendship. This could lead to them fighting side - side against the various threats in the One Punch Man universe, and they might even change the public perception of Garou from a villain to an anti - hero.
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.
Another interesting one is 'Sister of the Bat Clan'. In this story, the sister character has a unique backstory that ties into the overall Bat family lore. It explores her relationships with the different members, like her bond with Robin, and how she becomes an important part of the family's fight against crime.