Ron Weasley would most likely be a main character as well. His loyalty to Harry and his sense of humor add a lot to the story. He could be involved in any adventures or challenges that Harry and Hermione face, whether it's exploring a new part of Hogwarts or facing off against a new enemy.
Hermione Granger would also be a main character. She's Harry's best friend and her intelligence and magical knowledge are always important in any story related to the wizarding world. She could be helping Harry solve new problems or study new areas of magic.
Obviously, Harry Potter himself would be one of the main characters. He's the hero of the original series and his story would likely continue in this fanfic.
Harry Potter himself could be a main character. He has a history of standing up against injustice, so it's likely he'd be involved in a revolt. Hermione would also be a key figure. Her intelligence and knowledge of the wizarding world's laws would be invaluable in planning and leading a revolt. Ron, with his loyalty and courage, would be right there with them.
Harry Potter would probably be one of the main characters. He's the central figure in the original series, so it's likely he'd be involved in this fanfic in some capacity, perhaps as the hitman or someone related to the hitman - style plot.
Most likely, Harry Potter, Hermione Granger, and Ron Weasley will still be the main characters. After all, they are the central figures in the original series. But there could also be new characters introduced who are either part of their wealthy new circle or those who are affected by their millionaire status.
Obviously, the illithid would be a main character. It could be a mysterious and powerful being that Harry encounters. Also, Hermione and Ron might still be important characters. They could be either suspicious of the illithid or try to help Harry understand it better. Dumbledore might also play a role, perhaps guiding Harry in his interactions with this strange new creature.
Most likely the children of the main characters from the original series. Like James, Albus, and Lily Potter. Also, the kids of Ron and Hermione, like Rose and Hugo.
Another possibility is that new characters might be created specifically for this fanfic. These characters could be hybrids of the two universes, having traits from both the Toaru series and Harry Potter. They could be students at Hogwarts who also possess esper abilities, or wizards who are involved in the affairs of the Toaru series' world. This would add a fresh and unique element to the fanfic.
Voldemort would remain a major character. Harry's new abilities and perspective from being raised by Death would make their conflict even more complex. Harry might approach the fight against Voldemort with a different strategy, one that is influenced by the teachings of Death.
Obviously, Harry Potter himself. And then there would be the goblins. Maybe Griphook, as he was one of the more well - known goblins in the original series. He could be one of the main trainers of Harry.
Obviously, Harry Potter would still be one of the main characters. Since it's about second chances, he might be dealing with things he didn't get to do right the first time. Hermione Granger would also be a key character as she's always been resourceful and could play a big role in making the most of these second chances. Ron Weasley too, as he's Harry's best friend. And perhaps some characters who were on the fringes in the original, like Luna Lovegood, could step into more prominent roles this time around.
Obviously, Harry Potter himself would be one of the main characters. He's always at the center of things at Hogwarts. Hermione Granger would also be a main character as she is Harry's friend and is very intelligent, she would be trying to solve the problems during the lockdown. Ron Weasley too, as he's part of the trio. And of course, Professor Dumbledore, who would be in charge of handling the lockdown situation and making decisions for the safety of the students and the school.