Fanfiction.net is also a good place to look. There are many different categories and tags you can search through to narrow down your search for this specific type of fanfiction. Just type in 'Harry is Mokuba' in the search bar and see what comes up.
One popular story could be 'Harry and Mokuba's Unlikely Bond'. In it, they might meet in a magical world that combines elements of both their universes. Harry could use his magic skills to help Mokuba out of some tricky situations in the digital realm.
In the fanfiction, Mokuba may come across some lesser - known students at Duel Academy as well. These students could have unique dueling styles or backstories. Maybe there's a shy student who Mokuba befriends and helps gain confidence in their dueling abilities.
One common theme is family. Their brotherly bond is often explored deeply. Another is growth, like Mokuba growing up under Seto's guidance. Protection is also a big theme, with Seto being very protective of Mokuba.
Characteristics of yugi x mokuba fanfiction include their shared growth. As the story progresses, they both learn and develop as characters, often because of their relationship with each other. There's also a sense of protection. Yugi might protect Mokuba or vice versa, and this protective instinct is often explored. Moreover, the fanfictions can have a lot of cultural elements from the Yu - Gi - Oh! series, such as the importance of cards and the rules of dueling, which are intertwined with their relationship story.
I don't think it's common. Common fanfiction themes often involve things like battles, alliances, and character pairings. The idea of Mokuba sucking a baby bottle is rather unusual and not something you'd typically find in the general pool of fanfiction. It's more of a niche and very specific concept that might only appeal to a small subset of fans who are into really off - beat interpretations of the character.
First, focus on their personalities. Seto is often portrayed as a confident and intelligent character, while Mokuba is more innocent and loyal. Build a story around their unique traits, like a story where they work together to solve a mystery in the dueling world.
Archive of Our Own (AO3) is also a great place to look for kaiba x mokuba fanfiction. It has a wide variety of works, and the tagging system makes it easy to filter out exactly what you're looking for. Some stories might be more focused on their relationship development, while others could be adventure - based with their relationship as a backdrop.
One good kaiba x mokuba fanfiction could be 'The Bond Beyond Brothers'. It focuses on their strong relationship and how they support each other through various challenges in the Yu - Gi - Oh! universe.
One common theme is family bonds. Since they are brothers in the original context, some fanfictions might explore the relationship in a different way, like a deeper emotional connection that could be misconstrued as something more romantic. Another theme could be protection, with Seto being very protective of Mokuba.