One common theme is the exploration of forbidden love. Given their different backgrounds and the nature of their relationship in the original story, it makes for a very interesting dynamic in a romantic context.
Yes, there are quite a few. Some can be found on fanfiction platforms like Archive of Our Own. However, the quality varies. Some focus more on the unique dynamic between the two characters, exploring their personalities in new and interesting ways within the fan - created scenarios.
One common theme is his inner conflict. Fanfics often explore how he was torn between his loyalty to Voldemort and his own sense of self. For example, in some stories, he might question the extreme measures Voldemort asks him to take.
One common theme is redemption. Since Barty Crouch Jr was a Death Eater with a lot of wrongdoings, many fanfics explore the idea of him finding redemption through his connection with Harry Potter. Harry is often seen as a symbol of hope and goodness, so it makes sense that he could be the catalyst for Barty's change.
One common theme is redemption. Since his actions in the original story were quite dark, many fanfictions explore whether he could be redeemed. Writers often show his inner conflict between his loyalty to Voldemort and his own sense of right and wrong.
One common theme is redemption. Many fanfictions explore whether Barty Crouch Jr could be redeemed after all the bad things he did. Another theme is his relationship with his father. Writers often delve into how that strained relationship affected his actions and his path in life.
Redemption is another theme. Barty Crouch Jr, being a Death Eater, has a lot of bad deeds. Fanfictions may show his journey towards redemption, especially when in the presence of Harry Potter, who has a knack for seeing the good in people. And how Tom Riddle's lack of redemption contrasts with this.
In many Barty Crouch Jr x OC fanfictions, the theme of identity discovery is present. The OC might help Barty Crouch Jr come to terms with who he really is, beyond his role as a Death Eater. There's also the theme of sacrifice. The OC or Barty Crouch Jr may be put in a situation where they have to sacrifice something for the other, like their reputation or safety, which makes for an intense and emotional story.
One common theme is redemption. Barty Crouch Jr. was a dark character, and many fanfictions explore the idea of him being redeemed through his interactions with Hermione. For example, in some stories, Hermione's kindness and wisdom make him question his evil ways.
One common theme is the clash of good and evil. Hermione represents the side of good and Barty Crouch Jr. is typically associated with the dark side. Their interactions often explore how Hermione might try to redeem him or at least understand his actions.
The relationship could start with hostility. Harry, knowing all the bad things Crouch Jr. has done, is full of hatred. But as the story progresses, he could learn about Crouch Jr.'s tragic backstory, which might make him more empathetic.