Well, it could be about their adventures in the Beyblade world together. Maybe they team up to compete against a powerful opponent. They might discover new techniques and strategies along the way.
One common theme is friendship. The reader often forms strong bonds with the beyblade characters. Another is competition, as beyblade is all about battles. Romance can also be a theme in some stories, where the reader might have a romantic relationship with a character.
Romance is also a very prevalent theme. Writers usually develop a romantic relationship between Kai and the reader. It could start with a simple crush and gradually develop into a deep love, like in stories where Kai realizes his feelings for the reader during a crucial moment in a beyblade championship.
One common theme is rivalry - turned - friendship. In the original Beyblade series, Ryuga and Kyoya are rivals, and in fanfiction, this often evolves into a deeper relationship. Another theme is the power struggle. They both are strong bladers, so stories might explore how they balance their power and how it affects their relationship.
The potential for character growth. They could both grow as bladers and as people. For instance, Mariam might become more confident in her abilities with Max's support, and Max could learn to be more patient from Mariam. This growth can be really exciting to read about.
A common plot element is the oc being a new challenger in the beyblade world and Nile taking them under his wing. For instance, the oc might be from a different region and Nile helps them understand the local beyblade culture. Another one is the two of them forming a team to compete in tournaments.
A good plot could be Yu and Kenta teaming up to face a powerful and mysterious new blader. They train together, overcome their individual weaknesses, and in the process, their friendship deepens.
Their relationship could start off rocky due to their different fighting styles. Kai is more aggressive while Mingming is more strategic. But as they compete against each other more often, they start to see the value in each other's approach. This mutual understanding could lead to a friendship.