One common theme is the struggle between good and evil. Regina, who has her own history of darkness, and Dark Swan, who is literally a darker version, often battle this within themselves and with each other. Another theme is redemption. Dark Swan might be on a path to find redemption, and Regina could play a role in that. Power is also a theme, as they both possess significant magical abilities and there can be power struggles or power sharing between them.
One great Regina and Dark Swan fanfiction is 'The Battle Within'. It delves deep into the complex relationship between Regina and Dark Swan, exploring how their powers and personalities clash and sometimes align. Another is 'A Dark Alliance' which focuses on them teaming up against a common enemy and how that changes their dynamic. There's also 'Redemption's Path' that shows Dark Swan's journey towards redemption with Regina's influence.
Another one to check out is 'Regina and Emma: Partners in Time'. It takes an alternate universe approach, where they have to face new challenges together. The story is full of action and also has some sweet, tender moments between the two characters, which makes it a great read for fans of Regina Mills and Emma Swan.
Snow White and Charming could play important roles in interacting with Regina. They've had a long and complicated history with her. In this fanfiction, they might initially be distrustful of her as the Dark One, but as the story progresses, they could see that she's still the Regina they know and try to find a way to help her. Also, Rumplestiltskin, being a former Dark One himself, could interact with Regina, perhaps mentoring her in some way or warning her about the dangers of the dark power.
One great 'Dark Emma and Regina Fanfiction' is 'The Darker Path'. It explores a different side of their relationship where they are both facing some internal darkness. The story is well - written, with great character development and an engaging plot that keeps you hooked from start to finish.
Romantic relationships between them are also a common theme. Many fans ship Regina and Emma, and fanfictions explore their potential romantic connection. These stories often deal with the challenges they might face in a relationship, given their complex personalities and pasts, which makes for some really engaging and emotional reads.
One idea could be to explore how Regina's pregnancy changes her relationship with Emma. Maybe they become closer as they prepare for the new addition to their family. They could face challenges together, like dealing with the reactions of the townspeople in Storybrooke.
She becomes more brooding. As the Dark One, Regina has to deal with the dark thoughts and desires that come with the power. So she may isolate herself more, spending time in dark places and being less social with the people in Storybrooke.
Perhaps there could be a focus on the new family dynamic. Regina and Emma might start to plan for the future, like where the baby will sleep and how they'll raise it. They could also have disagreements on parenting styles, which would add some drama to the story.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions, and you can easily search for 'Dark Emma and Regina Fanfiction' using the search bar. There are filters available too to narrow down your search based on things like rating, word count, etc.