Typically, there is a duke as one of the main characters. He is often a powerful and wealthy man in the aristocratic society. And there is a female lead, who could be a commoner or a lower - ranked aristocrat.
In these novels, the duke is usually a complex character. He may have responsibilities and a past that shapes his actions. The female character might be intelligent and independent, not easily swayed by the duke's status. For instance, she could be a seamstress or a governess who gets involved in a deal with the duke. Their different backgrounds and personalities create the basis for their relationship development.
The main characters also often include the duke's family members or friends who play important roles in either facilitating or hindering the relationship between the duke and the female lead. There might be a meddling mother or a loyal best friend. These supporting characters add more depth and drama to the story of 'The Duchess Deal' romance novels.