The wizarding world would have a complex reaction. On one hand, many would support Harry as they believe he can bring positive change. On the other hand, there would be political factions within the wizarding world. Some might try to use Harry's new position for their own gain, while others would be cautious and want to maintain the status quo. Harry would have to navigate these different reactions and interests to ensure the stability of both the wizarding and non - wizarding parts of England.
The Hogwarts professors would have mixed reactions. Dumbledore would be very diplomatic and open - minded. He would try to establish communication and see how the Yautja King could fit into the grand scheme of things in the wizarding world. Snape might be more suspicious and view the Yautja King as a potential threat to the safety and secrecy of the wizarding world. But as the Yautja King proves himself, Snape's opinion might change. And the students would be mostly in awe and a bit scared at first, but then some of them would be eager to interact with this strange and powerful being.
He could be shocked. Maybe there are some fanfictions that take a very dark turn or have unexpected pairings that he never thought of. He'd probably need some time to process such strange ideas. And he might also be curious to see how far the creativity of the fans can go. He might even get some new ideas about his own life from reading some of the more imaginative fanfictions.
He may be confused at first. Fanfics can be very different from his real experiences. He might wonder why people write such things about him and his world.
Well, Harry Potter is a rather humble character. He might initially feel a bit embarrassed to see himself as the center of so many fictional stories created by fans. If the fanfic portrays him as a hero in new adventures, he would probably be honored. However, if it misrepresents his friends or the values he holds dear, he could be a bit indignant. He would likely approach it with an open mind but also with a sense of protectiveness towards his own story and those he loves.
Harry might initially be shocked and confused. He's used to Hogwarts being his safe haven, so when it turns against him, he'll be at a loss. He may try to prove his innocence by finding evidence or confronting those who are spreading lies.
The headmaster might be a bit surprised at first. He would likely respect Harry's opinion, though. He has always valued Harry's thoughts and feelings. He may start to think about the implications of fanfiction on the wizarding community and how it might affect the students and the overall perception of Hogwarts.
As time goes on, Harry could start to explore what it means to 'please' Sirius. He might recall their past relationship, the things Sirius likes and dislikes, and try to use that knowledge to his advantage. He may also feel a sense of loyalty towards Sirius that, despite the odd circumstances, makes him more accepting of the situation. For example, he might remember Sirius' love for adventure and try to engage in some magical adventures with him in a way that 'pleases' him.
He could be initially shocked. Harry, who has trusted Ginny deeply, would find it hard to believe at first. He might go through a period of denial, trying to find excuses for Ginny's actions.