Beloved can be spooky, sure. But the spookiness carries more than just shock value. The supernatural elements of the novel—ghosts! risen babies! spells!—usually have to do with the past making itself known in the present. Especially when the present is looking like it's about to head off happily into the future.
Questions About The Supernatural
Is Beloved Sethe's baby girl, back from the dead; or is she a runaway slave?
Why does Beloved appear on 124's porch on the day Sethe, Paul D, and Denver go to the carnival? Is there any significance to that day?
Other than Beloved, what characters have a supernatural feel to them?
Chew on This
Beloved isn't actually Sethe's daughter come back to life. Sethe's just projecting her past onto a poor, runaway slave who's suffering from amnesia.
Beloved returns from the dead because Sethe refuses to let go of the past.