Voldemort can be a common character in such fanfics. If Harry dies, it might be at the hands of Voldemort or related to the fight against him. And Dumbledore, even though he might be dead in the original series, his influence and legacy could still be a part of the 'Harry Death Fanfic'. His wisdom might be something that the other characters reflect on after Harry's death.
Neville Longbottom could be a significant character. He has always been a strong and brave character. In a 'Harry Death Fanfic', he could step up in the absence of Harry. For example, if Harry dies before fully defeating Voldemort, Neville might take on the mantle and lead the fight, using the inspiration he got from Harry while he was alive.
Another theme is the exploration of life and death. These fanfics often look at the boundaries between the two. They might show Harry having the ability to see the souls of the dead, or being able to influence the passage of souls. It gives a different perspective on the afterlife in the Harry Potter universe.
Well, in 'death loves harry fanfic', a frequent theme is the blurring of boundaries. The boundary between the living and the dead, between a normal human experience and the supernatural. Since Death is in love with Harry, it can lead to Harry having access to knowledge or abilities that are beyond the normal wizarding realm. Another theme is redemption. Maybe Death's love is a way for Harry to redeem himself from past mistakes or to find a new path that he wouldn't have considered without this strange relationship. And there's also the theme of mystery, as the nature of Death's love and what it truly means for Harry is often left open to interpretation and exploration throughout the fic.
Well, the theme of moral ambiguity is quite prevalent. In 'Death Eater Harry fanfic', Harry is in a world where the lines between good and bad are blurred. He might be doing things that are considered wrong in the original series but in the context of the fanfic, it could be seen as a way to survive or achieve a greater good. There's also the theme of friendship. Harry's relationships with other characters, both new and old, are redefined as he becomes part of the Death Eater world.
Obviously, Harry is one of the main characters since he's in the title. But without reading it, it's hard to say who else might be in it. There could be characters from the original source material that the fanfic is based on, like his friends or enemies. Maybe there are also new characters created specifically for this fanfic that interact with Harry in his role as the angel of death.
Obviously, Harry would be one of the main characters. Since it's about him becoming death, he's at the center of it. There might also be his friends like Hermione and Ron. They could be reacting to Harry's transformation, either trying to help him or being afraid of the change in him.
One common theme is the exploration of power. Harry, being the Master of Death, has a certain level of power, and when combined with the Twilight universe, it often leads to stories about how he uses or struggles with that power. For example, how he might interact with the vampires and werewolves in the Twilight world with his unique abilities.
Obviously, he could meet Darth Vader. Their encounter would be really interesting as they are from two very different fictional universes. He might also come across Luke Skywalker. They could form an alliance, with Harry sharing his knowledge of magic and Luke sharing his skills with the Force. Another character could be Han Solo. Harry would be amazed by Han's piloting skills and Han would be intrigued by Harry's magic.
Obviously, Harry and Tony Merchant are the main characters. Harry could be a heroic type, with special abilities or skills. Tony Merchant might be a more complex character, perhaps a bit of a rogue but with a good heart.
Obviously, Harry Potter is the main character as it's about him being the 'Son of Death'. His friends Hermione and Ron are likely to be important characters as well. They always play significant roles in Harry's life. Dumbledore might also be a key character, perhaps guiding Harry in understanding his new identity.
There could be an antagonist in the fanfic. Maybe someone who had a vendetta against Harry Merchant and was somehow involved in his death. This character would add conflict to the story as the people left behind try to figure out what really happened to Harry.