It really depends on the specific fanfiction. It could still be Harry, Hermione, and Ron if the writer wants to stay close to the original characters. They might be the ones to discover the chaos control element.
Obviously, Harry Potter is the central character as the title implies. He is the one who is taking control in the story.
Well, 'harry potter chaos control fanfiction' might center around a character or group of characters who have the ability to control chaos in the wizarding world. This could be related to the political chaos, like the power struggles between different wizarding factions. Fanfiction writers could explore how these characters use their power to either bring order or create more chaos for their own motives.
Obviously, Harry Potter is the main character as he is the Son of Chaos in this fanfic. His character would likely be different from the original series, having more unpredictable and chaotic traits.
Harry Potter himself is often still a central and popular character in chaos fanfiction. His actions usually set off a chain of chaotic events. Hermione is also popular as she tries to use her intelligence to fix the chaos. Then there's Fred and George Weasley. Their prank - loving nature makes them perfect for chaos - filled stories as they often add to the mayhem rather than help resolve it.
Obviously, Harry Potter is a main character as the title implies. But usually, his friends like Hermione and Ron are also likely to be important. They would be there to support Harry in his new role of taking control.
Voldemort or his followers might also be antagonists. Even if Voldemort is defeated in the original story, in this fanfiction, his remaining Death Eaters could see Harry's new power as something they can either use or must destroy. Or perhaps a new dark wizard inspired by Voldemort's ideology rises up against Harry.
Harry Potter himself is often involved. Writers might explore what would happen if he had more control over his powers from the start. Hermione Granger is also popular. She's known for her intelligence and control over her studies, so in fanfiction, she could be given even more control over magical knowledge or spells. Another one is Draco Malfoy. Fanfic writers might give him the ability to control his family's dark legacy and turn it into something positive, or he could be given control over some new form of magic.
There are some original characters in Harry Potter fanfiction that are associated with mind control. For example, a new dark wizard who has emerged from a hidden part of the wizarding world. This character might have developed a unique form of mind control that combines magic with some form of ancient mind - bending techniques. And then there are the students in fanfics who might discover or be forced into learning mind - control magic, and they become associated with it as they struggle with the moral and practical implications.
The Chaos Gods themselves could be the main antagonists. Their very nature is to create chaos and disorder, which would be directly opposed to the order and stability that Hogwarts and the wizarding world try to maintain.
Naruto himself is often very popular. Fans like to write about him exploring the concept of chaos control, perhaps using it to become an even more powerful ninja. His positive attitude and determination can be interesting to explore in the context of this new power.