One common theme is friendship. The reader often becomes friends with the KND characters and they go through various challenges together. Another theme is adventure. They might embark on missions to save the world or just have exciting escapades in the KND world.
Another common theme is loyalty. The reader has to prove their loyalty to the KND cause or to a particular character. There are often stories where the reader is tested in some way, and their loyalty is what helps them overcome difficulties. And of course, there are themes related to the unique aspects of the KND world, like the different sectors, the villains they face, and how the reader fits into all of that.
Adventure is also likely to be a theme. Given the nature of the KND world, fanfictions might involve Nigel and Wally going on missions together and how their relationship develops during those escapades.
Sure. You can start by looking on platforms like Archive of Our Own. There are many talented writers who create interesting 'knd x reader' fanfics. Some might focus on the unique adventures the characters from KND go on with the reader-insert, while others could explore different relationships and emotions within the KND universe.
The theme of shared interests also pops up a lot. Since Kenma loves video games, many fanfics show the reader and Kenma bonding over games, whether it's playing together or just discussing their favorite titles. This shared interest helps to strengthen their relationship.
One common theme is friendship - turned - love. It often starts with the reader and Pidge being friends or comrades, and then romantic feelings start to develop. Another theme is adventure. Since Pidge is often involved in exciting situations, the reader gets to be part of those adventures too, and their relationship blossoms during those times.
Love and redemption are common themes. Since Sasuke has a troubled past, often the reader character is there to help him find redemption and in the process, they fall in love. For example, in many fanfics, the reader's love and understanding slowly change Sasuke's view of the world.
Love and friendship are also big themes. It can start as a friendship that slowly blossoms into love. The journey of how their relationship evolves from just acquaintances to something deeper is often explored. Like in some fanfics, they start as classmates at Jujutsu High and then feelings start to develop over time.
One common theme is redemption. Since Bucky has a complex past, many fanfics focus on how the reader helps him find redemption and come to terms with his past actions.
Adventure is also popular. Blake and the reader might embark on a journey through a fantastical world, facing various foes and discovering new things. Another common theme is friendship. Even if there's a romantic undertone, the friendship aspect between the two characters is often developed, showing how they support and understand each other in different situations.
A common theme is survival. Since deathclaws are often seen as dangerous in their original context, the fanfic might focus on how the reader survives encounters with them, or even turns a deathclaw into an ally for survival.
A big theme is the forbidden aspect. Vampires are often seen as outcasts or monsters in the lore, so a relationship with a human reader is usually forbidden. This adds a lot of tension to the story. Another theme could be transformation, either the reader becoming a vampire or the vampire changing for the love of the reader.