One great Starlight x Spike fanfiction is 'A Magical Bond'. It explores their unique relationship in a world filled with new adventures. The story beautifully portrays how they support each other during difficult times.
You can try fanfiction websites like Fimfiction. It has a large collection of My Little Pony related fanfictions, including many about Starlight and Spike.
One reason is the contrast between their characters. Spike is a dragon with a kind heart, and Starlight Glimmer has her own complex backstory. Their interactions can be really interesting. For example, Spike can bring out the lighter side of Starlight Glimmer, and she can help him become more confident in different situations.
You can start by looking on popular fanfiction websites like Fimfiction. There are often numerous stories featuring this pairing. Another good place is Archive of Our Own (AO3), which has a large collection of My Little Pony fanfictions, including Spike x Starlight Glimmer ones. Some of these fanfictions explore their relationship in different ways, such as adventures they go on together or how they help each other grow as characters.
In Homelander x Starlight fanfiction, one common theme could be the struggle for Starlight to maintain her integrity in a world dominated by Homelander's influence. Writers might create scenarios where she tries to change him or at least limit his more tyrannical tendencies. Another aspect could be the star - crossed lovers idea, where their relationship is doomed due to their opposing positions in the superhero world.
One popular trope is the 'enemies to lovers' trope. Given their different outlooks and Homelander's often villainous actions, this is a common way to build a relationship in fanfiction. Another is the 'power imbalance' trope, where Starlight has to deal with Homelander's overwhelming power.
One common theme is the idea of magic and mystery. Since both twilight and starlight have an air of the unknown, fanfictions often explore this aspect, like how the two might be related in a magical sense.
A common theme is friendship. Since they are characters from the same universe, many fanfictions explore how their friendship grows and develops over time.
One common theme is the exploration of their complex relationship. Given their history of rivalry and shared vampiric nature, many fanfictions dig deep into how they interact with and feel about each other.
Another theme is loyalty. Despite their differences and occasional rivalries, they are often shown to be loyal to each other in fanfictions. For example, in many stories, they will go to great lengths to protect one another.