A good pairing could be with Kuroko. Since Kuroko has his own unique style of play, the male OC could complement him. For example, if the male OC is a strong offensive player, he can work well with Kuroko's misdirection skills on the court, and off the court, they can have a friendship based on their mutual love for basketball.
One idea could be that the male OC is a transfer student with a unique basketball skill, like a super - fast dribble. He challenges the Generation of Miracles in a friendly match and through his determination and teamwork, he earns their respect.
A possible plot for a Female Kuroko x Akashi fanfiction could be set in an alternate universe where there are no gender - based restrictions in basketball teams. Female Kuroko joins Rakuzan instead of Seirin. Akashi, as the captain, is initially skeptical but soon realizes her potential. They start training together intensively. As they do so, they begin to develop feelings for each other. However, they face opposition from some of the team members who are not used to the idea of their captain being involved with a female teammate. But through their strong bond and love for basketball, they overcome these obstacles and their relationship blossoms.
One great Akashi x OC fanfiction might be one where the OC is a new manager for the team. The story could explore how Akashi's strict leadership style and the OC's fresh perspective interact. They might start off clashing but gradually develop a deep connection as they both strive for the team's success.
In such a fanfiction, perhaps it could start with Kuroko being targeted by a rival team who want to disrupt Seirin's plays. They might kidnap him on his way home from practice. His teammates would then start a frantic search, led by Kagami. They would scour the city, following any leads they could find. In the end, they manage to rescue Kuroko and their bond becomes even stronger through this ordeal.
When writing an Akashi x OC fanfiction, think about the themes you want to explore. Love, friendship, competition in basketball are all good themes. For the OC, give her unique qualities. She could be a girl with a fiery temper who challenges Akashi's calm exterior. Write from different perspectives, not just the OC's or Akashi's. You can also include other characters from the Kuroko no Basuke series to make the story more interesting. Build up the tension and conflict in the relationship before leading to a satisfying resolution.
One idea could be an OC who is a transfer student with a unique basketball skill, like being able to predict opponents' moves from their body language. This OC could join Seirin and form a special bond with Kuroko and the team, helping them in tough matches against strong opponents.
One interesting scenario could be a training camp where Female Kuroko and Akashi are paired up for a special drill. They have to rely on each other's skills completely, which forces them to communicate and understand each other better. This close proximity during the drill could lead to some romantic tension.
Develop their backstory in detail. Maybe your OC grew up in a small town where basketball was not very popular, but they were inspired by a traveling basketball team. This backstory can influence their playing style and their goals in the fanfiction. You can also give them a specific motivation, like they want to prove that players from small towns can be great at basketball too. In addition, their relationships with other characters are crucial. If they have a friendly rivalry with one of the main characters, it can add depth to both characters.
In a lot of these fanfictions, the theme of growth is present. They both grow as basketball players and as individuals. Their relationship is often a catalyst for this growth. For example, Murasakibara might become more motivated because of Himuro's drive, and Himuro might learn to relax a bit more from being around Murasakibara. And of course, the theme of their shared past, like their time in middle school, is frequently explored to give depth to their current relationship.