Male yandere characters in stories are often overly possessive. They have an intense and sometimes obsessive love for the object of their affection. For example, they might not allow their loved one to have any other friends or interact with others freely.
A great male yandere story is 'Diabolik Lovers'. The male characters in this story often exhibit yandere - like traits, especially when it comes to their relationships with the female lead. They are overly possessive and their actions are sometimes extreme in their desire to keep the girl close to them. Also, in some darker versions of fairytale retellings, there are male characters who turn into yanderes. For instance, in some reimagined versions of 'Beauty and the Beast', the Beast can show yandere - like tendencies towards Belle in terms of his possessiveness and jealousy.
In yandere x reader fanfics, yanderes usually display intense emotions. Their love for the reader is not the normal kind; it's more of an obsessive love. They may have a dual personality where they can be extremely sweet and loving one moment, but if they feel threatened in their relationship with the reader, they can turn very dangerous and menacing.
Give her a troubled past. For example, she could have been bullied or abandoned as a child. This can be the root of her yandere tendencies as she's afraid of losing the male reader. It makes her over - protective and possessive.
One common theme is possessiveness. Male yandere characters often feel an intense need to own or control the object of their affection. For example, they might not allow the love interest to interact with other people freely.
They can be very obsessive. They will focus all their attention on the person they love. Their actions are often centered around this person, whether it's protecting them from harm or trying to keep them in a certain place. In some cases, they may go to great lengths to achieve their goals related to the person they're obsessed with. This might include sacrificing themselves or others in extreme situations.
There's also 'The Yandere Male Kagome's Quest'. This one is different as it focuses more on the male Kagome's journey while still maintaining his yandere traits. He goes on adventures, all the while being possessive and overprotective of the people he cares about. It's a unique take on the yandere concept in a fanfiction setting.
Male yandere characters often start with an initial attraction. It could be a simple crush at first. Then, as the story unfolds, this attraction grows into an obsession. For example, if the object of his affection shows kindness to someone else, it might trigger his yandere side more. His actions become more extreme as he tries to eliminate any potential rivals or threats to his relationship with the person he loves.
One common theme is extreme possessiveness. The male yandere character often wants to have the object of his affection all to himself, to the point of being overbearing. Another theme is secrecy. He might hide his true, obsessive nature from others while plotting ways to keep his love interest close. And a third theme could be the transformation of the yandere. Maybe he starts off seemingly normal but gradually reveals his yandere tendencies as the story progresses.