One common theme is friendship. Aichi and Kai's relationship often starts as a friendship based on their shared love for Cardfight Vanguard. Another theme is growth. They grow both as cardfighters and as individuals in these fanfics. For example, they might learn new strategies or overcome personal weaknesses. And of course, there's often a theme of competition as they face each other in cardfights.
One way is to show them outside of cardfights. Maybe they start hanging out more, like going to card shops together to look for new cards. They could talk about their lives, their dreams related to cardfighting. Also, if one of them gets into trouble, like Aichi being bullied by some other cardfighters, Kai could come to his rescue. This would strengthen their bond. Another aspect could be that they start training each other's decks, sharing their insights on different card combinations. Through these interactions, their relationship can grow in a more personal and friendly way.
One popular 'Cardfight Vanguard Aichi x Kai fanfic' is 'Bound by the Vanguard'. It has a great plot that delves deep into their relationship, showing how they support each other during tough cardfights. Another one is 'Aichi and Kai: The Unseen Bond' which focuses on their friendship growing into something more special. There's also 'Vanguard Hearts: Aichi and Kai' which has some really interesting character development for both of them.
There's a fanfic called 'Kai and Aichi: A New Adventure'. In this one, they embark on a journey to discover a new type of card that could change the world of Cardfight Vanguard. The story is filled with action, friendship, and a bit of mystery as they face various opponents and obstacles along the way.
One common theme is friendship. Their relationship in the original series is quite deep, and in fanfictions, it often gets explored further. For example, how they support each other through tough cardfight battles.
The popularity of Cardfight Vanguard Kai x Aichi fanfics lies in the complex relationship between the two characters. Their dynamic, with Kai being a more experienced and often aloof player and Aichi being the determined newbie, creates a lot of room for interesting stories. Fans love to explore how they interact, compete, and eventually grow together.
Well, a good plot for their fanfiction could be that Kai has lost his confidence in his cardfighting skills after a major defeat. Aichi then steps in to help him regain his confidence. They train together, share their strategies, and in the process, their relationship deepens. Or perhaps they are both on a quest to find an ancient cardfighter who is said to hold the secrets to ultimate victory. Along the way, they face many challenges and their bond grows stronger.
You can try searching on fanfiction websites like Archive of Our Own (AO3). There are often a lot of works related to Cardfight Vanguard Kai and Aichi. Just use the search bar and type in the relevant tags, and you should be able to find some interesting fanfictions.
Romance is also a prevalent theme. Fans often like to imagine a romantic relationship between Aichi and Kourin. So, you'll find many fanfictions that focus on their budding love, with cute moments and relationship - building scenarios.
One common theme is friendship. Since they are characters from the Cardfight Vanguard world, their bond as friends is often explored. Another theme could be support. They support each other in their cardfight endeavors in many fanfictions.