Definitely Yuno Gasai from 'Future Diary'. Her extreme love and possessiveness towards Yukiteru make her stand out. She is willing to kill anyone who gets in the way of her relationship with him. Her cute appearance combined with her terrifying actions create a very memorable character.
Sekai Saionji from 'School - Days' is also quite memorable. She initially seems like a normal girl, but as the story progresses, her actions driven by jealousy and love turn her into a character that leaves a strong impression. She is a key part of the complex love triangle in the story.
Natalya in 'A Month in the Country' is also quite memorable. She is a young woman full of passion and longing. Her feelings towards the tutor are a mixture of attraction and confusion, and her character development throughout the story is interesting as she grapples with her emotions in a restricted social environment.
Annabeth could potentially be a yandere in some fanfictions. Since she already has a strong connection with Percy in the original series, some fanfic writers might take that to an extreme, making her overly possessive. Another could be a new, made - up character. Maybe a demigod who has been watching Percy from afar and then develops an unhealthy obsession.
In the 'Best of Husbands' novel, if there is a character who has a very difficult decision to make and the way they handle it is both unexpected and in line with their developed character, that character could be very memorable. For instance, a character might have to choose between loyalty to a friend and following their own moral code. The way they navigate this dilemma and the consequences that follow can etch them into the reader's memory.
I remember a yandere story where a character was convinced that their love interest's pet dog didn't like them. So, they tried to win the dog over by dressing up as a dog themselves. They ran around on all fours, barking and wagging an imaginary tail. The love interest walked in on this scene and couldn't stop laughing. The yandere was a bit embarrassed at first but then joined in the laughter.
There could be a character like Tom. He might be memorable because of his unique personality, say he's very brave in the face of danger. Another one could be Mary, who has a really kind heart and is always helping others in the stories.
Uhtred is surely one of the most memorable. His journey from a Saxon noble captured by the Danes to a warrior with a complex identity is really engaging. Then there's Alfred. His leadership and his vision for the Saxon kingdom are quite remarkable. And Brida too. She is a strong female character, fierce in battle and with her own set of beliefs.
One of the well - known yandere characters is Yuno Gasai from 'Future Diary'. She is extremely possessive of her love interest, Yukiteru Amano. Yuno is willing to do anything, including murdering others, to ensure that she is the only one in Yukiteru's life.
Rival characters can be popular too. For example, Osana Najimi. Writers might focus on her relationship with Senpai and how she tries to protect herself from the yandere's schemes. There could be fanfictions where she discovers the yandere's true nature early on and has to come up with elaborate plans to stay alive and keep Senpai for herself.
One memorable character could be the brave knight. He is always ready to fight for justice and protect the weak in the 'the best of all possible worlds mc stories'. His courage and chivalry make him stand out.
Violet from 'Murder House' is memorable. She's a troubled teen who has to deal with not only the typical teenage angst but also the fact that she's living in a haunted house. Her relationship with Tate and her discovery of the house's secrets are some of the most engaging parts of the 'Murder House' storyline.