Obviously, Harry Potter himself. There could also be Japanese wizard characters who are his opponents in the dueling tournament. Maybe Hermione and Ron could come along with Harry, or they could be back at Hogwarts while Harry is in Japan, but still communicate with him. There might also be some Japanese magical teachers or judges in the tournament.
Harry is the main character for sure. Then, there could be some original Japanese characters created specifically for this fanfic. They might be young wizards training hard for the tournament, or experienced wizards who are mentoring the participants. Additionally, some of the characters from the original Harry Potter series like Hagrid could make a cameo appearance, perhaps sending Harry some magical item from Hogwarts that helps him in the tournament.
The main character would be Harry. There could be a Japanese wizard who is like a prodigy in dueling and becomes Harry's main rival. There may also be some side characters like a Japanese witch who helps Harry understand the local magical customs. And don't forget about the tournament organizers, who could be important characters in the story, setting the rules and creating the challenges for the dueling tournament.
It could involve Harry Potter participating in a dueling tournament set in Japan. Maybe he meets new wizards, discovers unique Japanese magical spells and creatures during the tournament. There could also be cultural clashes and fusions, like how the Western style of dueling he's used to interacts with the Japanese magical traditions.
He could win the tournament and gain great fame. In many fanfics, Harry might show off some new spells he's learned, impressing everyone.
Another possibility is a new character created specifically for the fanfic. This character could have some unique magical abilities or a special connection to dark magic that makes them a formidable opponent for Harry. They might have been training in secret for a long time just to face Harry in the tournament.
Then there's Max, a Muggle - born wizard who has to face a lot of prejudice in the tournament. His journey of proving himself against all odds makes him a beloved character in many fanfictions. He shows that determination and hard work can overcome the barriers of blood - status in the wizarding world.
In a Harry Potter Dueling Champion fanfic, Draco Malfoy could be a potential rival. He has a strong sense of pride and is always eager to prove himself. His family's pure - blood heritage gives him access to some powerful magic and knowledge. Another could be Hermione Granger. She is extremely intelligent and has a vast knowledge of spells. Her thirst for knowledge and competitiveness would make her a formidable opponent in a dueling championship. And then there's Viktor Krum. He is already a well - known and skilled wizard from Durmstrang, with his own unique style of magic that could pose a serious challenge.
One interesting storyline could be a character who is an underdog in the dueling tournament but discovers a hidden power or spell that helps them succeed. For example, a Hufflepuff student who has been overlooked in the past suddenly masters an ancient dueling technique.
One possible fanfic could focus on Harry's training to become the dueling champion. He might study new spells, practice his reflexes, and learn from the best dueling masters at Hogwarts. This could lead to some intense and exciting duels against other skilled students.
A wizard from a small and unknown magical family could be an underdog. They don't have the resources or the big - name connections like the students from the major wizarding families. But they might have a unique style of dueling or a special spell that gives them an edge, and they fight their way through the championship against all odds.
Obviously, Harry himself is the central character. Hermione and Ron would also likely be involved. They are Harry's best friends and usually play important roles in his adventures. Hermione with her intelligence might help Harry figure out strategies for the tournament tasks, and Ron with his loyalty would be there to support Harry.
The plot could revolve around Harry's journey to prove himself as the dueling champion. He starts with basic training, gradually improving his skills. Then, he enters local dueling competitions at Hogwarts. As he progresses, he faces tougher opponents, some of whom might be secretly working against him. This creates a lot of suspense and action in the story.