In Hazbin Hotel fanfiction with Alastor x Reader, Alastor is often depicted as a complex character. He's charming yet menacing. His radio - themed appearance and mannerisms add to his allure. He's a powerful demon, and in these fanfictions, his relationship with the reader can range from a dangerous flirtation to a more protective bond.
One common theme could be the exploration of new relationships. For example, how Alastor's pregnancy might change his relationship with other characters, whether it's friends or foes. It could also be about the challenges he faces during the pregnancy, like dealing with his own powers while his body is changing.
One common theme is the clash of two different worlds. Since Alastor is a rather unique and often dark character, the fanfic usually shows how his wife, who might be from a different background, copes with his demonic nature.
Well, a smut novel refers to a book where the focus is heavily on sexual themes and often has very detailed and graphic descriptions of sexual acts. It's not for everyone and is usually considered more adult-oriented.