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.
Her magic might become darker. Since she is in the realm of Hades, associated with death and the afterlife, her spells could take on a more somber tone. For example, her Patronus, which is usually a positive form of magic, could transform into something more related to the underworld, like a spectral dog with a smoky appearance.
In this fanfiction, perhaps it delves into the character development of the 'consort of Hades' within the context of the Harry Potter world. This character might have to navigate the complex social structures of Hogwarts while also having ties to the underworld. They could introduce new forms of magic or ways of thinking that are a blend of both realms.
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.
Obviously, Harry Potter himself could be one of the main characters. He might be involved in the story as he discovers the existence of the consort of Hades and has to deal with the implications. Another potential main character could be the consort of Hades. Their actions and decisions would drive a lot of the plot as they interact with the Harry Potter world.
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, in the original Harry Potter story, Harry meets a lot of magical beings within the wizarding world. But if it's fem Harry Potter meeting Hades, it's a whole different realm. She'd be in a much darker, more foreboding place. Instead of Hogwarts corridors, it'd be the gloomy underworld. And Hades is not like any of the characters in the wizarding world. He has his own set of rules and powers that are completely alien to what fem Harry is used to.
In certain fanfiction, Harry Potter can be the reincarnation of Hades. Fanfiction authors often take creative liberties and blend different mythologies or concepts. They might be inspired by the idea that Harry has a connection to death (surviving Voldemort's killing curse as a baby) and Hades is the god of the underworld. So, they create a story where Harry is Hades reincarnated, perhaps with hidden powers or a different destiny related to the magical and mythological elements of both the Harry Potter series and Greek mythology.
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.
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.