Hermione would definitely be an important character. She's smart and resourceful, so she'd be the one researching ways to restore Harry's memory. Ron would also be crucial as he's Harry's loyal friend. He'd be there to support Harry and keep him out of trouble. Dumbledore or other wise Hogwarts professors like McGonagall could also play significant roles. Dumbledore might have some secret knowledge or plan to help Harry, and McGonagall could provide guidance and protection at Hogwarts.
Obviously, Hermione is a key character. She'd be constantly by Harry's side, using her vast knowledge of magic to try and figure out how to reverse his memory loss. Ron would be right there with them, adding his own brand of humor and loyalty. Luna Lovegood could also be an important figure. Her unique perspective on the wizarding world might offer some unexpected insights into Harry's condition. And of course, the Weasley family as a whole might get involved, providing a sense of family and support for Harry during this difficult time.
Harry Potter himself, of course. He has always been at the center of things in the wizarding world. His actions and decisions would likely have a great impact on any change that occurs.
Obviously, his brothers are very important. Donatello would be crucial as he could try to diagnose Leo's illness. Raph would be there to provide protection and strength if any threats come while Leo is vulnerable. Mikey would be the emotional support, trying to keep Leo's spirits up.
Obviously Naruto himself is the central character. His growth and new abilities would be the focus. Sasuke could also be important. He might have his own development and his relationship with Naruto could be explored further, whether they are friends or rivals again.
Naruto himself is obviously a central character. His growth and decisions will shape the story. Hinata could also be important as her relationship with Naruto might develop further. Shikamaru, being one of Naruto's smartest friends, could play a crucial role in planning for Konoha's future and strategizing against potential threats.
Obviously, Peter Parker himself is a key character. His naivete and enthusiasm for heroism would be a big part of the story. Then there's Captain America from the Rogue Avengers. He would likely be the moral compass of the group. And Black Widow, with her skills in espionage and combat, could also be important in strategizing against any threats they face.
Dumbledore could also play a role. He might see Harry's weight loss journey as part of his overall growth and offer some cryptic yet inspiring words. Maybe he arranges for Harry to have special training sessions with the ghosts of Hogwarts, who have unique ways of making exercise fun. And of course, the Hogwarts professors like Madam Pomfrey could be involved, ensuring Harry's health during his weight loss process.
Neville could play an interesting role. Maybe he could be the one who discovers a new magical plant that is needed for a potion to cure an illness that Ginny or Harry contracts during their marriage. Luna could also be involved. She might come to them with some strange but useful prophecies that help them in a difficult situation, like dealing with a dark wizard who has a grudge against Harry even after the war is over.
Well, obviously Harry himself is the central character. But aside from his friends, characters like Draco Malfoy could have a different relationship with Harry. Instead of being just a rival, he could be an ally of sorts in Harry's dark journey, or perhaps he tries to use Harry's newfound darkness for his own gain. Snape too could be important. Given his complex relationship with Harry, he might be in a position where he has to choose between helping Harry return to the light or letting him continue down the dark path.
Hermione would definitely be important. She could use her extensive knowledge to help Harry understand his creature inheritance. For example, she might research ancient texts to find out more about the origin of his inherited traits.
Hermione would surely play an important role. She could help Harry figure out the details of his inheritance, like deciphering old documents or researching the history behind it.