Another character that could be important is Snape. His relationship with Harry has always been complex, and with Harry's new identity, Snape might have a different attitude towards him. Additionally, characters from the Potter family that we haven't seen much of in the original series could be introduced to help Harry understand his Potter heritage better as part of his new role as Lord Potter - Black.
Obviously, Harry Potter himself would be one of the main characters. Since it's about his connection to the Lord Black trial. Sirius Black's presence might also be felt strongly, even if not physically present, as his past and the Black family's reputation are central to the trial. Hermione and Ron would most likely be there too, as Harry's closest friends, providing support and using their intelligence and skills to help Harry through the trial.
Obviously, the Storm Lord is one of the main characters. Harry Potter himself would also be a main character as the story is set in the Harry Potter universe. Hermione and Ron might also be important as they are Harry's friends and would likely be involved in any major events related to the Storm Lord.
In addition to the regular Harry Potter characters, there could be a character who is a descendant of an ancient wizard family associated with the sun. This character could be a key figure in the fanfiction, as they might have a special connection to the 'lord of the sun'. They could be a bridge between the normal wizarding world and the new element of the 'lord of the sun'. This would create interesting dynamics as the other characters from Harry Potter would have to work with this new character to understand and deal with the 'lord of the sun'.
In addition to the regular Harry Potter crew, there could be a character who is a native of the 'Lord of the North' and acts as a guide for Harry and the others. This character could have unique magical abilities related to the northern environment, like being able to control ice or snow magic, and would play a crucial role in their adventures.
Well, Harry Potter himself would likely be one of the main characters. He'd be in the middle of the action, trying to figure out what the Phantom Lord is up to and how to stop them. Hermione would also be there, using her vast knowledge of magic to help Harry. Ron would be by their side too, providing his loyalty and courage.
Obviously, Harry Potter is one of the main characters. Since it's related to his connection with the Peverell family, he would be central to the story.
Obviously, the Lightning Lord is a main character. There could also be the classic Harry Potter characters like Dumbledore who might play a role in the story. They could be either guiding the Lightning Lord or trying to figure out their intentions.
Since I haven't read this particular fanfiction, it's hard to say exactly. But it's likely that the black princess is one of the main characters. There might also be some of the original Harry Potter characters like Harry, Hermione, or Ron who could interact with her.
The main characters would be the Black sisters for sure. They could be joined by other members of the Black family, like Sirius Black who has his own backstory and connection to the family. Additionally, some of the Death Eaters might be involved as the Black family has a connection to the Dark side in the original story, which could add a layer of conflict and danger in the fanfiction.
It's possible that the main characters could include some powerful wizards who are made into lords in the fanfiction. Their wives could be witches with special talents. Maybe there's a lord who is a powerful dark wizard turned good, and his wife is a healer. The relationships between these characters, their goals, and how they interact with the wizarding world around them would be central to the story.