The childhood best friend that played a major role in the main character's development of a human being? Well, they're a little too close for the yandere of your story to be comfortable with allowing their existence. They must die, and painfully at that~ especially if they're not the same gender as the main character.
Now, whether or not the yandere plays show-and-tell with the MC immediately after or waits until the final psychotic snap at the end of the story to reveal the horrendous deed... That's completely up to you.
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The Rules of Writing Yandere
Non-FictionKey points to make your yandere dangerously loveable! <3