The Narrator is a static because he changes through out the story, hes round because he changes a lot like his mood.
The dead girl would be the antagonist because the narrator is both the antagonist and the protagonist, we don't know what characteristics of her are
"Her throat cut from ear to ear"
"I knew strawberry spring had come again."
"she thinks I was with another woman last night "
The mood of the story is scary because, one night every 5 to ten years a killer would come to a college campus and kill one person and leave them by the canons, also its scary because at the end you figure out that the main character is the killer.