If Harry was adopted by the Joker in fanfiction, it could lead to some really interesting character development. Harry might start to develop a warped sense of humor and a disregard for the law like the Joker. On the other hand, he could also be a source of conflict within the Joker's world. Maybe Harry would try to resist the Joker's influence and secretly work towards bringing him down. It would be a battle of wills between the two, with Harry having to use his wits to survive in the Joker's crazy world.
His personality would likely become more erratic. The Joker's influence is all about chaos and anarchy. Harry might start to laugh at inappropriate times and find pleasure in causing trouble just like the Joker. He could lose his sense of empathy as he is constantly exposed to the Joker's cruel and inhumane behavior.
I'm not sure if there is a specific instance where a 'Joker' would be directly involved in raising Harry Potter fanfiction. Usually, fanfiction is created and promoted by fans themselves within the fan community, not by a character like the Joker.
Well, if we're talking about the Joker from the Batman universe, there's no canonical information indicating he has any knowledge of Harry Potter fanfiction. He's more preoccupied with chaos in Gotham. But in some wild crossovers in fan - created works, he might be depicted as knowing it, just for the fun of mashing up different universes.
The Joker as a professor in Harry Potter fanfiction? That's a wild idea. He could be the professor of Dark Arts in a very different way. Instead of the traditional Dark Arts that the wizarding world knows, he would introduce his own form of 'dark art' which is more about psychological torture and mind games. His classes would be full of his maniacal laughter and unexpected challenges. Students would have to constantly be on their toes, not knowing what he'll do next. He might even use his students in his elaborate schemes against the other professors or the Ministry of Magic.
One common theme is family. Since Harry is being adopted, the new family dynamics, love, and acceptance are often explored. For example, how he forms bonds with his new family members.
One great fanfiction could be 'The New Beginning' where fem Harry's life takes a magical turn after being adopted by Zatanna. It explores how Harry discovers her new powers and her relationship with Zatanna.
Ron could also be there. He might be a bit jealous at first if Harry's adopted family is wealthier or has more influence in the wizarding world. But later, he would support Harry as always.
One possible plotline could be that Harry, after some dark magic influence or a strange accident, starts to show Joker - like behavior at Hogwarts. He might play cruel pranks on his classmates and teachers, using his magic in unexpected and unethical ways.
One common theme is the clash of two different worlds. The orderly and magical world of Harry Potter with its own set of rules and the chaotic, lawless world that the Joker represents. Another theme could be the corruption of innocence. The Joker might try to influence the young wizards and witches at Hogwarts, corrupting their pure intentions.