To be your ghost story, I would first start by being unpredictable. I won't follow the normal patterns of behavior that you're used to. I might disappear for a while and then reappear suddenly. I'll also tell you some really strange and captivating stories that are so unique that they'll stick in your mind like a ghost story. And I'll use my body language and tone of voice to add to the overall 'ghostly' effect. For example, I could lower my voice when sharing something particularly mysterious, or give you a certain look that makes you wonder what I'm really thinking.
One possible plotline could be about a character who has a menacing appearance but is actually kind-hearted. For example, a vampire who is misunderstood in a small town. People fear him because of his nature, but he's determined to show that he won't hurt anyone. He might start by saving a child from a dangerous situation, like a burning building. This could be the beginning of his journey to gain the trust of the townspeople.
It could be a young witch as the main character. In a world where witches are often associated with dark magic and harm, she practices only white magic. She moves to a new town and has to constantly convince the locals that she's not there to cause trouble. Her spells are all about healing, protecting the environment, and bringing good luck, but people are still skeptical at first.
Well, you could start from the very beginning. Think about the most important event or moment that sets the whole story in motion. For example, if it's a story about a trip, you might start with the decision to go on that trip.