The unique personalities of Jon and Eduardo make it appealing. Jon's somewhat naive and Eduardo's more serious nature can create interesting dynamics in a fanfiction. Their relationship, whether it's a friendship or something more, can be explored in many different and creative ways.
Some Eddsworld - related forums might also be a good source. These are communities dedicated to the Eddsworld fandom. Members might share their own fanfictions or know where to find some good ones about Jon and Eduardo.
One common theme is friendship. Since Edd and Eddy are friends in the original, many fanfics explore different aspects of their friendship, like how they support each other through tough times.
Friendship is a very common theme. Most fanfictions explore how Edd and Matt are friends and how their friendship grows and evolves. For instance, they might face a problem together and through that, their bond becomes stronger.
Some fanfictions might have a theme of self - discovery within the context of their relationship. As they get closer, they learn more about themselves. For example, Edd might discover a new side of himself through his interactions with May, and vice versa. There could also be themes related to family acceptance if their relationship faces opposition from their families in the story.
Growth is also a frequent theme. Edd could help Kevin to grow out of his bully - like behavior, and Kevin can help Edd to be more assertive. Also, the theme of acceptance is there. They learn to accept each other's quirks and differences, which is really sweet to read about.
One common theme is the exploration of an unlikely relationship. Since Edd and Marie might seem like an unexpected pair in the original context, fanfics often delve into how they get together and what makes their relationship work.
Friendship is a very common theme. Since they have different personalities in the original context, exploring how they become friends or strengthen their friendship is popular. Another is growth. They might grow as individuals while being in each other's company.
Friendship is a common theme. Writers often explore how Edd and Kevin can move from being just acquaintances or rivals to true friends. Another theme could be growth. They might show how both characters grow as individuals through their interactions with each other.