Hermione Granger might also be a key character. She could be involved in researching the theory behind the shadow clones and helping Harry control or improve this new form of magic.
Ron Weasley could play an important role too. Maybe he has some doubts about the shadow clones at first but then comes to see their value in various situations, like during a dangerous mission against Voldemort's forces.
Well, in many 'harry potter shadow mage fanfiction' stories, there is a young shadow mage as the central character. This character is usually on a journey of self - discovery, learning about their powers and their place in the wizarding world. Ron might also be involved, providing some comic relief and loyalty to his friends as they deal with the new and often dangerous world of the shadow mage. And then there could be an older, more experienced shadow mage who acts as a mentor to the younger characters.
Well, Naruto is definitely one of the main characters, since it's about him being the master of the shadow clone. There might also be his friends like Sasuke and Sakura. They could play important roles in supporting Naruto's development with his shadow clone abilities or be involved in battles where Naruto uses his jutsu.
Obviously Naruto is a main character as it's about his shadow clone. But there could also be Sasuke. Maybe Sasuke discovers something strange about Naruto's shadow clones and gets involved in the mystery.
One interesting idea could be how the shadow clones are used in magical battles within the Hogwarts setting. They might be used as decoys to outwit opponents, like when facing Death Eaters.
Often, Harry Potter himself might be a main character. He could be transported to the 'Star Wars' universe and have to learn the ways of the Jedi. Another could be Luke Skywalker, who might find himself in Hogwarts and have to deal with magic. Hermione Granger could also be a central figure, using her intelligence to bridge the gap between the two different worlds.
A half - blood character could be the main character. They have a connection to both the magical world of Harry Potter and, through some strange family heritage, to the Clone Trooper world. This character could be on a quest to find a way to merge the two worlds' strengths, believing that the combination of magic and Clone Trooper technology could bring peace to both universes. They would face opposition from those who fear change and from dark forces in both worlds.
Hermione Granger often features prominently. Her intelligence and thirst for knowledge make her a great candidate to explore shadow magic. She might be the one to uncover ancient texts about it and start experimenting.
Definitely Hermione. Her intelligence and vast knowledge of magic would be a great asset if cloned. She could help solve complex magical problems and come up with strategies in battles.
In many such fanfictions, Kakashi could play an important role. He has experience with Naruto's shadow clones and could offer guidance on how to control them or stop the incident from getting worse. Also, characters like Jiraiya might show up. Jiraiya could teach Naruto some new techniques to better manage his clones, or he might be involved in uncovering the mystery behind the abnormal clone behavior.
Harry Potter himself is often a popular character in these fanfictions. Since he's the main character in the original series, it's easy to incorporate him into the shadow monarch concept. Another popular one could be Hermione. Her intelligence could be combined with shadow monarch powers in really interesting ways in fanfiction.