One common theme is identity struggle. Since she's the daughter of Hades, she has to figure out where she belongs in both the wizarding world and the realm of the gods. Another theme is power and its control. Her powers from Hades are often very different from typical wizarding magic.
One great fem Harry and Hades fanfiction is 'Underworld's Rose'. In this story, fem Harry has a unique encounter with Hades in the underworld. The author does a wonderful job of portraying the relationship between them, with a touch of mystery and a lot of character development.
Well, one unique plotline could be her relationship with her father, Hades. In some fanfics, she might be trying to earn his respect in a different way than a male Percy would. For example, she could use her femininity to her advantage in the Underworld politics.
She could be a protector. In a fem Harry as Hades' mate scenario, she would likely be a powerful figure in the underworld. She could use her skills and powers to protect Hades' realm from external threats. Maybe there are other dark forces from different mythologies or from the wizarding world that want to take over the underworld, and she would be at the forefront of defending it, while also being Hades' partner and support.
The contrast between their worlds. Harry comes from the wizarding world full of magic wands and spells, while Hades rules the underworld. When they meet in fanfiction, it creates a whole new dynamic. It's like mixing two different types of magic.
It's very likely. Fanfiction allows for all kinds of imaginative scenarios. Considering the diverse nature of fanfiction communities, where people blend different universes and characters, the idea of fem Harry being Sombra's daughter could be a really interesting and unique take that some author has explored. It might not be a common pairing, but in the realm of fanfiction, that doesn't matter much.
One popular trope is the 'fish out of water' scenario. A fem Harry Potter in the realm of Hades would be quite out of place. She'd have to adapt to the dark and often unforgiving world of Hades. Another is the 'powerful outsider' trope. Given Harry's magical abilities, she'd be a force to be reckoned with in Hades' domain. And the 'romantic entanglement' trope is also common, perhaps a relationship between fem Harry and Hades or one of his minions, adding a layer of drama and passion to the story.
Perhaps it begins with a misunderstanding. Fem Harry could be mistaken for someone else in Hades' realm. Hades, being a powerful and somewhat solitary figure, might be initially hostile. But as he discovers her true identity and her own unique story, his attitude changes. Their relationship could develop as they both realize they have common enemies or goals. For example, they might both be fighting against a greater evil that threatens both the wizarding world and the underworld. This shared purpose could bring them closer together, and eventually, they could become mates.
One possibility could be that Fem Harry Potter brings her unique magic skills to the underworld. She might use her Gryffindor - like courage to face the various challenges in Hades' realm. For example, she could help in maintaining order among the souls. Also, her experience in fighting dark wizards in the wizarding world might be applied to dealing with any potential threats in the underworld.
One common theme is identity. Since she's Female Harry and the daughter of Hades, she often struggles to figure out who she really is in relation to both her wizarding self and her underworld heritage. Another theme is power. Her connection to Hades gives her unique powers, and stories often explore how she uses or struggles with these powers. For example, in some fanfictions, she has to learn to control her dark magic.