Obviously, Harry Potter himself is crucial. He is the main character around whom the whole story revolves. His friends Ron and Hermione are also very important. They support Harry throughout his adventures, with Ron providing loyalty and humor, and Hermione her intelligence and knowledge.
Harry Potter would most likely still be one of the main characters. His journey and development would be a central part of the story, even with the twists.
Well, let's start with Harry Potter himself. Harry was an orphan who lived with his horrible aunt, uncle and cousin. He then discovered he was a wizard and went to Hogwarts. There, he faced many challenges like fighting Voldemort, made great friends like Ron and Hermione. His life was full of adventures from battling dark wizards to exploring the secrets of Hogwarts.
Harry Potter would be a central character. There may be some original shinobi characters created specifically for this fanfiction. His Hogwarts professors could also play important roles, perhaps being involved in the shinobi training or having some sort of connection to the shinobi world. And of course, if there are any antagonists, they could be from either the wizarding or the shinobi side, or a combination of both, making for some really interesting conflicts.
Obviously, Harry Potter is the central character. But in this fanfiction, 'life' could be personified as an important character too. It might be some sort of spirit or entity that has a big influence on Harry's upbringing.
Hermione Granger is also a favorite. Fanfic authors might write about her solving complex magical problems or having adventures that the original books didn't cover. She's such a strong and intelligent character that there are endless possibilities for her in fanfiction.
Since I haven't read this particular fanfiction, it's hard to say for sure. But it could feature Harry Potter himself, maybe he encounters this 'no life king' character and has to deal with whatever chaos or mystery they bring. It might also include his friends like Ron and Hermione who could be involved in trying to understand or stop the 'no life king' if they pose a threat.
Well, of course, there would be the Auror as the central character. Maybe it's an original character created for the fanfiction. There could also be appearances by well - known characters like Harry Potter himself, who could be a mentor or a colleague to the Auror. And perhaps Hermione, who could provide some intellectual support or be involved in some magical research that the Auror has to protect.