Well, 'That Time I Got Reincarnated as a Slime' can be considered in this regard. Rimuru, the main character, experiences an isekai adventure, and there are some characters with possessive or extreme loyalty traits that could be loosely related to yandere. Also, 'Log Horizon' is an isekai novel where the characters' relationships and their growth in the new world might have some yandere - like undertones at times.
Well, 'yandere kanojo ga isekai novel' could potentially be a story where the female lead who is a yandere gets sent to an isekai world. Maybe she uses her yandere tendencies to get what she wants in that strange new world. It could be full of drama, as she might be overly protective of someone she likes in the isekai world, or she could be causing chaos because of her extreme love and possessiveness.
The 'isekai yandere novel' genre often focuses on characters with obsessive and possessive traits in the isekai setting. In contrast, other isekai genres may center more on adventure, power - building, or exploring the new world. For example, a typical adventure - focused isekai might be about the main character exploring dungeons and fighting monsters, while an isekai yandere novel will likely have a character who is overly attached or possessive of another, which can drive the plot in a different direction.
I'm not familiar with the specific details of this novel, but typically in such a story, the yandere kanojo would be a main character. There could be a male lead that she becomes obsessed with in the isekai world. And then there might be side characters like the local inhabitants of the isekai world, perhaps a wizard who helps or hinders her, or a group of warriors that she has to interact with depending on the plot of the novel.
For me, 'That Time I Got Reincarnated as a Slime' stands out. The world-building and plot development are really engaging. Also, the characters have a lot of depth.
Well, it's a bit hard to pinpoint exactly which was the very first one. But some early examples could include 'El-Hazard: The Magnificent World', which had elements of the isekai genre.
Yandere male characters in manga usually show an intense, single-minded focus on the object of their affection. They might seem charming at first, but their behavior can become unstable and dangerous as their obsession grows. This can make for a thrilling and dark storyline.
Yandere sister manga often feature intense and obsessive emotions. The sister character might be overly possessive and show extreme behavior towards the protagonist.
Hentai manga isekai typically features outlandish settings and sexual content. The storylines can be quite unconventional and focus on fulfilling certain fantasies. However, it's important to note that such content may not be suitable for all audiences.