As I don't know their novels well, it's difficult to say. But common themes in many novels could include love, friendship, and the search for identity.
Since I don't know the exact works of Lister Sam Michaels and Daniel Davis, another option would be to ask in book clubs or literary forums. People there are often well - read and might be able to point you in the right direction. You could also look for any awards or nominations their novels might have received, which could be an indication of quality.
Love is a very common theme. Her characters often find themselves in situations where they have to navigate through different types of love, like romantic love, family love, and friendship love.
Family is a very common theme. His novels often show the dynamics within families, like love, conflict, and loyalty.
Another theme is the historical context. Fanfics often depict the social and cultural norms of their time and how Ann Walker and Anne Lister defied those norms for their relationship. It shows their courage and the difficulties they faced because of society's expectations.
Another theme is his relationships. Fanfic writers might explore his friendships, romantic relationships, or family relationships. They could create stories about how he meets new people and how those relationships develop. It gives fans a chance to see different aspects of his character in relation to others.
One common theme is friendship. Davis and Kari's relationship is often explored in depth, showing how they support each other through different situations in the Digital World.
The main themes could be about the contrast between their ideologies or the representation of different political stances. Maybe it shows the power struggle or the differences in their visions for the country.
Another theme is love and loyalty. Their relationship is usually depicted as being very strong and full of loyalty towards each other. For example, in many fanfics, they will go to great lengths to protect one another.
One common theme is the power of friendship. Betty and Daniel often start as friends in these fanfics, and their relationship grows from there. Another theme is the exploration of different worlds. Since they come from different backgrounds, fanfics may focus on how they bridge that gap.
One common theme is identity. Since Daniel has amnesia, he often struggles to figure out who he really is. Another theme is redemption. Sometimes his past actions before the amnesia come back to haunt him, and he has to make amends.