Well, it might involve strategic planning and careful manipulation of circumstances. Maybe the character needs to find allies or expose the emperor's weaknesses.
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.
You could show your firm attitude and make it clear that you have no intention of reconciling. Maybe avoid giving him any false hopes or ambiguous signals.
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 are many possible reasons. Maybe the childhood friend had always secretly loved the protagonist and couldn't handle any competition. Or, some trauma or insecurity could drive them to be obsessive. Another possibility is that misunderstandings or external pressures played a role.
Well, such a girl is often obsessive and possessive. She might go to extreme lengths to keep the person she likes close to her, sometimes even using violence or threats.