The theme of Ruby in alternate universes is also quite common. Authors create scenarios where Ruby might be in different situations or have different powers. This allows for a lot of creativity and exploration of different storylines that couldn't be told within the constraints of the original show.
One popular theme is Ruby's relationships. For example, her friendship with Snow White or her romantic relationships within the story's universe. Writers often explore how these relationships develop and change over time.
Family relationships are a big theme. Some fanfics focus on the family dynamics between characters like the Charmings and their descendants. There are also fanfictions that revolve around the theme of identity. Characters in 'Once upon a time' often have complex identities, and fan writers like to dig deeper into how these identities are formed and how they can change over time.
One popular storyline is them going on adventures together in the Enchanted Forest. They might face various magical creatures and challenges while relying on each other's skills.
One popular storyline could be Ruby and Belle teaming up to solve a mystery in the Enchanted Forest. They might use Ruby's wolf - like senses and Belle's knowledge from all the books she has read.
One popular theme is alternate universes. For example, what if Emma Swan had grown up in the Enchanted Forest instead of our world. Another theme is exploring different relationships between characters. Some fanfictions focus on a deeper friendship between Regina and Snow White that might have developed under different circumstances. And then there are those that delve into the backstories of minor characters, like how the Blue Fairy came to be.
Redemption arcs are also quite popular. Given that many of the characters in 'Once upon a time' have complex backstories and have done bad things in the past, fans often write about their journey towards redemption. Family relationships are a big theme too. There are stories exploring the bonds between parents and children, siblings, etc., like the relationship between Snow White and her daughter.
One popular storyline is about Ruby, Regina and Emma teaming up to fight a new, powerful villain in Storybrooke. They combine their different powers and skills to save the town.
A 'found family' trope is quite common. Characters who were alone or estranged in the show form a close - knit family in fanfiction. For instance, Henry might bring together different characters who then become his new family. Also, the 'hurt/comfort' trope, where a character is hurt (physically or emotionally) and another character comforts them, is frequently used in Once upon a Time fanfics.
A common theme is friendship. Since Ruby and Dorothy are often characters in the same story universe, fanfictions might explore the depth of their friendship, how they support each other through different situations.
One popular theme is the exploration of Merlin's magic in different storylines. Another is his relationships, like his friendship with Arthur. Also, the struggle between good and evil is often a central theme.
One popular theme is redemption. Belle often plays a role in redeeming Rumpelstiltskin. For example, in many fanfictions, her love and belief in his better self help him overcome his dark side.