Well, a lot of 'crowley x reader' fanfictions have the theme of self - discovery. The reader might be on a journey of self - discovery while also getting involved with Crowley. Another theme could be the struggle between good and evil. Crowley has his own moral compass which might be different from the reader's, and this creates an interesting dynamic. There's also the theme of friendship or companionship that can develop into something more, which is often explored in these fanfictions.
A common theme is the discovery of their mate bond. It often starts with an unexpected encounter or a strange feeling that draws Crowley and the reader together. Another theme is the protection aspect. Crowley, being a powerful character, will do anything to protect his reader - mate from harm.
One common theme is protection. Crowley, being a demon with a complex personality, often ends up protecting the child reader from various threats in these fanfics. It could be other supernatural beings or just the general chaos of the world.
A theme that frequently appears is redemption. Crowley, being a demon, may be on a path of redemption through his relationship with fem Harry. There's also the theme of the outcast. Both characters can be seen as outsiders in some ways. Harry is often an outsider in the Muggle world and Crowley is an outcast among demons. Their relationship can be a way for them to find acceptance. And of course, there's the love and attraction theme, which is central to most fanfictions with this pairing.
Characterization. A good Crowley x Reader fanfiction nails Crowley's character. He should be that suave, sometimes morally - grey character we know from the source material. And the reader character should be relatable, like someone who could actually exist in that universe. For example, if Crowley is in his demon form, the reader's reaction should be believable.
I really like 'Crowley's Unlikely Companion'. In this fanfiction, the chemistry between Crowley and the reader is off the charts. It starts with a simple meeting but quickly escalates into a story full of adventure and a bit of mystery. The way the author writes Crowley's dialogues is very much in - character, which adds to the authenticity of the story.
One common theme is the exploration of their relationship outside of the constraints of Heaven and Hell. Since they are an angel and a demon, their relationship is unique and fanfictions often play with how they can be together despite their opposing natures.
Another theme is the exploration of power dynamics. Crowley and Ferid both have their own powers, and in fanfics, this can lead to interesting power plays between them. It could be about one trying to protect the other or them using their powers in tandem. Also, the theme of mystery is quite prevalent. Their characters are somewhat enigmatic, and fanfics often play on this, creating stories full of secrets and revelations that keep readers hooked.
One common theme is redemption. The OC might be the catalyst for Crowley to seek some form of redemption. Another theme is forbidden love, as Crowley is a demon and there are often barriers in a relationship with a normal OC. Also, power dynamics, like how Crowley's demonic powers compare to the OC's own abilities or lack thereof.
Another theme is the relationship between the OC and Crowley. It could be a friendship, a mentorship, or even a romantic relationship. In many fanfictions, this relationship is at the heart of the story and drives the plot forward. The development of this relationship over time is often a key aspect.
A sense of belonging is another big theme. The reader, who may feel like an outsider in the real world, finds a place where they belong among the mutants. There are also themes related to fighting for justice, just like the X - Men do in the original stories.