One common theme is friendship. Their relationship often starts as a deep friendship that has the potential to develop into something more. Another theme is sacrifice. They are often willing to sacrifice for each other in these fanfics. Also, the theme of redemption can be seen, as they help each other find a better version of themselves.
I'm not sure there are many specific fanfics just on this one aspect. However, you could start by looking on fanfic platforms like Archive of Our Own. Search for 'Banana Fish Eiji kidnapped' and you might find some relevant works. Some fanfics may explore different motives for the kidnapping, such as using Eiji to get to Ash or for some political gain within the complex world of Banana Fish.
In a fanfic, Eiji could get injured while exploring an abandoned building that has some connection to the Banana Fish mystery. Maybe he trips and falls, hitting his head. This could lead to a series of events where Ash has to take care of him, and in the process, their bond deepens as they share more personal stories while Eiji recovers.
One popular eiji and ash fanfiction might be those that explore their relationship in different settings, like in a modern AU (alternate universe). For example, a story where they meet in a college setting and their bond develops from there.
One popular eiji x ash fanfiction might be 'The Unspoken Bond'. It delves deep into their relationship, exploring how they support each other through difficult times. Another could be 'Beyond the City Lights' which focuses on their adventures together outside of their normal environment. There are also many that center around their emotional connection, like 'Hearts Entwined' which shows how they understand each other on a very deep level.
Yes, there are quite a few. You can find some on popular fanfiction websites. However, the quality can vary greatly. Some might focus more on the emotional connection between Ash and Eiji, while others could be more action - packed with their relationship as a side element.
You can find eiji x ash fanfiction on websites like Archive of Our Own (AO3). It has a large collection of fan - made stories for various fandoms, including Banana Fish where Eiji and Ash are from. Another place could be Fanfiction.net, although the content there might be a bit more mixed in terms of quality.
One common theme is friendship. Their bond is often explored in different ways, like how they support each other through tough times. Another theme is sacrifice. Ash, in particular, is often portrayed as being willing to sacrifice a great deal for Eiji.
You can start by looking on fanfiction websites such as Archive of Our Own (AO3). It has a large collection of fan - created works, including many eiji and ash fanfictions. The tagging system there makes it easy to search for specific types of stories you might be interested in.