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.
It depends. If the portrayal of the yandere girlfriend is done in an interesting and nuanced way, it could be appealing. But if it's overly stereotypical or one-dimensional, then no.
One common theme is extreme possessiveness. Yandere characters in these stories often view their love interests as their sole possessions. For example, they can't stand the idea of their loved one interacting with others, which often leads to stalking and isolating the person they love.
A common theme in yandere horror stories is the blurring of love and hatred. The yandere starts with what they think is love, but when things don't go their way, it quickly turns into hatred. For example, if the person they love shows interest in someone else, the yandere's 'love' morphs into a desire to harm or destroy. Also, themes of psychological manipulation are often present, as the yandere tries to control the life of the person they're obsessed with.
A gift from her in a yandere manga can have multiple meanings. It could be a sign of the yandere's obsessive love, an attempt to control the situation, or a way to create drama and tension in the story. Sometimes, it might even be a red herring to mislead the reader.
There's also 'School Days'. Kotonoha Katsura is involved in a complex and horrifying situation due to the yandere behavior of Sekai Saionji. Sekai's unhinged love for the male character leads to a series of tragic and violent events that shock the viewers.
There's a yandere horror story where a young woman moves into a new apartment. Her neighbor, a seemingly nice guy, turns out to be a yandere. He begins to manipulate her life, cutting off her contact with friends and family. When she tries to resist, he shows his true, violent nature. These stories often play on the fear of being the target of someone's unbalanced love and possessiveness.