Ron Weasley may also play a significant role. His loyalty to Harry and his skills in magic, especially in areas like chess which can symbolize strategic thinking, could assist Harry in different situations. Also, his family, the Weasleys, with their large presence in the wizarding community, could provide support to Harry in his endeavors.
Obviously, Harry Potter is the central character as the title implies. He is the one who is taking control in the story.
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.
One great 'Harry Potter Takes Control' fanfiction is 'The Power Within Harry' which shows Harry taking control of his destiny in a unique way. It has him making decisions that are different from the original story, like taking charge of his magical training earlier.
Obviously, Harry Potter is the main character as it's about him taking control. Hermione Granger is likely to be an important character as well, she would probably be by Harry's side, offering her intelligence and support.
In addition to the trio, some fanfictions might focus more on the characters from Slytherin. Draco Malfoy could be a main character in a different light. Instead of being just a rival, he could be an anti - hero or even an ally to Harry. There could also be new original characters created by the fanfiction author that play important roles in the story.
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.
One interesting plotline could be Harry Potter taking control of Hogwarts' curriculum. He might introduce new and more practical magic courses. For example, he could start a course on modern magical defense against dark forces in the wizarding world today, which includes dealing with new threats like dark wizards using Muggle technology in their spells.
Well, in such a fanfiction scenario where the Horcrux takes control, it would be a total chaos. Harry, for instance, if under the Horcrux's control, could turn against his friends. His moral compass, which is usually so strong, would be distorted. The Horcrux might try to use Harry's powers for its own evil purposes, like trying to resurrect Voldemort in a more powerful form or causing destruction within Hogwarts. It would also create a great internal struggle within Harry as he tries to fight against the Horcrux's influence.
If Harry takes control, he would ensure the safety of all students. He has faced so many threats at Hogwarts, so he'd strengthen the security. He might set up new wards and have more regular patrols. And he'd be very strict about the Forbidden Forest, making sure students don't go there without permission.
Obviously, Harry Potter is one of the main characters as the title suggests. There might also be characters like Hermione and Ron, his best friends, who would likely be involved in his journey with this new lordship. And perhaps some other characters from the original Harry Potter series like Dumbledore (if it's set in that time frame) or other members of the wizarding community who have an interest in this new development in Harry's life.
I think Harry Potter would be the central character. But Hermione Granger could also be a major character. She is very intelligent and would likely be helping Harry study for the MCAT. Also, Ron Weasley could be in it, providing some comic relief during Harry's stressful MCAT preparation. And maybe Dumbledore could make an appearance, giving Harry some wise advice about this Muggle academic endeavor.