You can try fanfiction.net. It has a large collection of various fanfics, including those related to 'joker x haru'. Another good place is Archive of Our Own (AO3). They have a wide range of fan - created content, and you're likely to find some great 'joker x haru' stories there.
Well, 'joker x haru fanfic' often varies in theme. Some might be interested in 'Shadows of Redemption', where Joker helps Haru overcome her inner demons. Then there's 'The Red Thread' which is a beautifully written fanfic about their fated encounter. Also, 'Haru's Choice' is quite interesting as it shows Haru making difficult decisions with Joker by her side.
One characteristic is the exploration of their relationship dynamics. Since they are two different characters, the fanfic often shows how they interact, whether it's friendly banter or deeper emotional exchanges.
I'm not sure if there is a specific 'haru x makoto sick fanfic' available. You could try searching on popular fanfic websites like Archive of Our Own or FanFiction.net.
Characteristics of 'haru x ren lemon fanfic' can vary widely. The relationship between Haru and Ren is central. In many such fanfics, the 'lemon' element indicates a degree of romantic or sexual content. This can range from subtly hinted at to very explicit, depending on the author's intended audience and the platform's rules. Often, these fanfics will take elements from the original source material, like the personalities of Haru and Ren, and build on them. For example, if Haru is portrayed as shy in the original, a fanfic might explore how that shyness plays out in a romantic relationship with Ren. The 'lemon' part might also be used to show the deepening of their connection, perhaps as a way to break down barriers between the two characters. Also, the writing style can differ greatly, from flowery and descriptive to more straightforward and to - the - point in depicting their relationship.
The fanfic might focus on the unique dynamics between Tokaku and Haru. For example, it could show how their personalities, one being more reserved perhaps (Tokaku) and the other more open (Haru), complement each other. It may also explore their shared experiences and how those shape their relationship within the story.
One common theme is friendship development. Their relationship might start as just acquaintances and gradually grow into a deep and meaningful friendship.