Power struggle is a common theme. The dark prince often has great power, and there's a struggle between his power and the psychic abilities of the other characters, which also adds to the romantic conflict.
Forbidden love is also typical. The dark prince may be from a different world or have a dark nature that society or the psychic character's group doesn't approve of, but they are drawn to each other romantically. For example, in many novels, the prince might be a creature of the night like a vampire or a demon, and the psychic is a human or a different kind of supernatural being.
One popular 'dark prince psychic romance novel' is 'A Shade of Vampire' series. It has elements of a dark prince - a vampire in this case - and psychic abilities among the characters which add to the romantic and mysterious plot.
A common theme is the exploration of extraordinary abilities. Since it's psychic - related, the characters often struggle with or embrace their powers while in a romantic relationship.
Adventure is a common theme. The pirate prince often takes the love interest on thrilling sea voyages filled with battles, storms and treasure hunts.
A prevalent theme is the transformation of the female protagonist. In many modern prince romance novels, the girl starts as an ordinary person and then has to grow into someone who can fit into the prince's world. Also, the theme of secrecy often plays a part. The relationship might need to be kept secret at first due to various reasons, like in 'The Selection' series where the competition rules and public perception add to the secrecy aspect of the relationships. There's also the theme of sacrifice, where either the prince or the female lead may have to sacrifice something for their relationship.
One common theme is the clash of cultures. The desert prince often represents a very traditional and sometimes exotic culture, which clashes and then blends with the more modern or Western culture of the female lead.
Power and control are common themes. The billionaire characters often have a lot of power in their business and personal lives, and this can play out in their romantic relationships in both positive and negative ways. Another theme is the past haunting the present. Their dark pasts, which might include things like family issues or past traumas, often influence their ability to love and be loved.
Power exchange is a very common theme. In these novels, one character typically has more power over the other in the BDSM relationship, which creates a dynamic and often intense story. Another theme is psychological exploration. The characters often have to face their inner demons and insecurities as they engage in BDSM activities.
One common theme is the struggle against societal prejudice. In these novels, the interracial couple often has to face the disapproval of their families or the community at large, which adds a dark and challenging element to their love story.
One common theme is forbidden love. In a historical context, there might be social barriers like class differences or family feuds that make the love between two characters forbidden. For example, in many novels set in the Victorian era, a commoner falling in love with an aristocrat was a big no - no.
The theme of secrecy is quite prevalent. The MC has its own set of rules and secrets, and when a romance blossoms, these secrets can either bring the couple closer or tear them apart. Another theme is the idea of the outsider. Often, the female lead is an outsider to the MC world, and her entry into this world and relationship with an MC member is a central part of the story. Also, the theme of family, not just in the traditional sense but also the MC as a family, plays a role in the relationships and the overall story.