Common themes include the struggle for control. Harry has a certain kind of control over death, and Hela has control over death in her own realm. So, there can be a battle or negotiation over who has more power in the realm of death. Also, themes of redemption can be present. Maybe Harry tries to redeem Hela, or vice versa, as they both have complex relationships with death and power.
Yes, there are some. You can try searching on fanfiction websites like Archive of Our Own. There are often creative takes on combining the worlds of Harry Potter and the concept of the Master of Death with Hela from other mythologies. Some may explore how Harry's powers as the Master of Death could interact with Hela's abilities.
One of the main themes is the exploration of life and death. As Harry is the master of death, fanfictions usually look into what this means in the context of the wizarding world. Also, the theme of destiny is quite common. It's about whether Harry was always meant to be the master of death and how he fulfills that destiny. In addition, friendship and loyalty are often explored as Harry's friends react to his new status.
One common theme could be power. Both characters are associated with significant power, so stories might explore how they handle it. Another could be identity, as a female Harry Potter would have a different experience than the original male character, and her encounter with Hela could shape or redefine that identity. And there could also be themes of friendship or rivalry.
A common theme is the exploration of different cultures. Harry's world has a very distinct wizarding culture, and Hela is from a different realm with its own set of rules and values. Fanfictions may show how they learn from each other's cultures. Additionally, the concept of fate is often explored. It could be that they are fated to meet and change the course of each other's lives, which makes for an interesting narrative in these fanfictions.
One common theme is the power of love. Just like in the original Harry Potter series, love is often portrayed as a strong force that can overcome many obstacles. In these fanfictions, it can be the love between two main characters that helps them face dark wizards or difficult situations.
It's hard to say precisely without reading it. But generally, in such a fanfiction, Harry Potter would be in a very different and probably challenging situation as the master of Hela. It could be that he has to navigate the politics and power struggles in a world related to Hela. He may also have to face enemies who are after Hela's power or want to oppose Harry's new role.
A common theme is the battle between good and evil. In 'Harry Potter', Harry as the Master of Death is constantly fighting against Voldemort and his dark forces. In 'The Hobbit', the dwarves and Bilbo are up against Smaug and other evil creatures. Fanfiction might focus on how the characters from both worlds team up to fight evil. Another theme could be the discovery of hidden abilities or knowledge. Harry discovers his true power as the Master of Death, and in 'The Hobbit', Bilbo discovers his courage and resourcefulness. Fanfics may show how characters from one world help those from the other to unlock their potential. Additionally, the theme of different cultures or races interacting is also likely. In 'Harry Potter' there are different magical races, and in 'The Hobbit' there are different species like dwarves, hobbits, and elves. Fanfictions could explore how these different groups interact when brought together.
One common theme is the clash of magic systems. Harry's magic from the Potterverse and the magic in the Eragon world are very different, and fanfictions often explore how they interact.
One common theme is the exploration of power. Since the 'Master of Death' concept involves a great deal of power, it's often about how the characters handle it. Another theme is crossover elements, like mixing the magic from 'Harry Potter' with the supernatural fighting in 'Buffy'.
Power and its consequences are a common theme. Since Harry is a godlike master of death, there's often exploration of how such extreme power affects him and those around him.