Harry is the central figure, of course. However, some fanfictions might introduce new characters. For example, a young Muggle - born witch or wizard who Harry takes under his wing to teach about magic and healing. There could also be a former Death Eater who has reformed and now wants to learn the ways of healing from Harry to atone for their past sins.
Most likely, the main character is the healer. They could be an original character created for the fanfic. There might also be appearances from well - known Harry Potter characters like Harry himself, Hermione, and Ron. Maybe the healer has to work with them to solve some sort of magical health crisis in Hogwarts or the wizarding world at large.
Since I haven't read it, I'm not sure. But it could be the healer with the imprint as one of the main characters. There might also be a patient or someone the healer is supposed to protect because of the imprint.
Well, obviously the Black Healer is one of the main characters. They are the center of the story with their healing abilities.
Well, it's hard to say for sure without reading the fanfiction. But it could be a young protagonist, perhaps a teenager, who is dealing with the typical problems of growing up like bullying or family issues. The story could then revolve around how they use time to heal from these difficulties.
Luna Lovegood is sometimes written as a mind healer in fanfiction. Her unique perspective and kind heart make her a great candidate. She can use her understanding of thestrals and other magical creatures to bring comfort to those with troubled minds.
Hermione could be important. She might help Harry with his studies, providing him with books and research materials on healing magic. Also, Ron could be there, perhaps he gets injured a lot in his new job and Harry has to keep patching him up. And then there could be the head healer at St. Mungo's who acts as Harry's mentor, guiding him through the complex world of healing.
In some 'healer novels', the main character, the healer, might be a young person who discovers their healing abilities and has to learn to control them. There could be a love interest, perhaps another character with some sort of special ability or knowledge, who gets involved with the healer's story. And there may be an authority figure, like a king or a guild master, who has an impact on the healer's life and actions in the story.
Not having read the 'the healer novel', we can only speculate. The main character is likely the healer. There may be a love interest for the healer, which could add a romantic sub - plot. And there could be an authority figure in the story, like a king or a village elder, who either supports or opposes the healer's actions, creating conflict and driving the story forward.
Neville Longbottom could also be considered a natural healer. He has a great affinity for Herbology. His skills in growing and understanding plants could easily translate into using them for healing. He could be the one to discover new uses for common and rare magical plants alike, perhaps creating poultices or potions from them to heal various ailments that the regular wizarding medical field hasn't fully explored yet.
I don't know the exact main characters in the'redo healer novel' as I haven't read it.