Another theme could be about the dragon's role in the fight against evil. In some fanfictions, the female dragon might be a key factor in defeating Voldemort or other dark forces. Its strength and unique magical abilities could be the difference between victory and defeat for the wizarding world.
Well, a major theme is adventure. Combining Harry Potter's world with dragons naturally leads to a lot of adventurous situations. Harry might go on quests with the dragons, explore new magical places, or face dangerous enemies together. Also, the theme of discovery is prevalent. Harry discovers new things about himself, his magic, and the world of dragons. For example, he might learn that he has a special ability to communicate with dragons that he never knew before. This discovery then drives the plot forward and adds more depth to the story.
One popular theme might be the exploration of altered states of magic. For instance, when a character is under the influence of a 'drug' in the fanfiction, their magic could be enhanced in strange ways, like being able to communicate with magical creatures on a deeper level.
One popular theme is the exploration of a forbidden or unexpected love. Since Daphne is from Slytherin and Harry is from Gryffindor, their relationship goes against the traditional house rivalries. Another theme is the discovery of hidden powers or secrets. For example, Daphne might have a secret magical ability that she shares with Harry. And a third theme could be redemption. Maybe Daphne has a past she's not proud of and through her relationship with Harry, she finds a way to redeem herself.
Yes, it could be. Dragons are quite prominent in the Harry Potter series. For example, there are dragon challenges in the Triwizard Tournament. So a fanfiction exploring Harry as a dragon fan makes sense and might be popular among fans who love the more fantastical and dangerous elements of the wizarding world.
I'm not sure if there is a particularly 'popular' one. There are so many fanfictions out there that it's hard to determine which ones are the most popular in this very specific 'Harry Potter marries a dragon' category. However, there might be some that have a small but dedicated following.
Yes, there are. You can find some on various fanfiction platforms. Some might explore unique relationships between a character from Harry Potter and a dragon in a yaoi - themed way. However, the quality and content can vary greatly.
One popular theme is mentorship. For example, if Harry meets a female hippogriff, he could learn about their ways and she could teach him something about the magical world that Hogwarts doesn't cover. Another theme could be cooperation, like Harry and a female goblin working together to solve a mystery in the wizarding economy.
I don't think there are really popular 'Harry Potter Scabbers lemon' fanfiction themes in a positive sense. The Harry Potter series is about magic, friendship, and good vs. evil. Creating 'lemon' content related to Scabbers, which is a rather odd concept in the first place, would deviate far from what the series is all about. It might also violate the ethical and moral boundaries of the fandom. So, in general, it's not a theme that should be promoted within the community.
As mentioned before, 'lemon' content is not appropriate. But for general Harry Potter and Bleach crossovers, a popular theme is the clash of different power systems. For example, how would a Death Eater fare against a Hollow in Bleach? Or how would a Soul Reaper react to the magic of Hogwarts?
One popular theme could be the discovery of the Changling's true identity within the context of the Harry Potter world. Another might be the relationship between the Changling and the main Harry Potter characters, especially in a romantic or 'lemon' - related way, like a forbidden love story.