The legal system in some fanfic settings might not recognize slavery as an illegal practice immediately. Anakin would have to fight through bureaucracy and convince lawmakers to change the laws. There could also be cultural acceptance of slavery in certain areas, and Anakin would have to overcome the deeply - rooted beliefs of the people there.
Anakin may face opposition from within the Jedi Order itself. Some Jedi might think that interfering in the slave trade is not their primary mission, or they might be afraid of the political implications. Also, he might struggle to protect the freed slaves from retaliation by the slavers, as he can't be everywhere at once.
One challenge could be the number of bounty hunters. If there are a large group, it would be difficult for Anakin to fend them off all at once. Another could be that the bounty hunters might have some special weapons or traps set for him.
One challenge could be resistance from the existing authority. There might be some teachers or administrators who don't want to give up their power easily. They may see Harry as too young or inexperienced.
The plot might center around Anakin's moral struggle. On one hand, he has the Jedi teachings, but on the other, his own past as a slave. This internal conflict could add depth to the story as he decides how far he's willing to go to free the slaves. He may also have to deal with the consequences of his actions in the eyes of the Jedi Council.
Another way in fanfic could be that Anakin discovers a plot by the slavers that is against the greater good or some galactic law. By exposing this, he forces the system to free the slaves. He may also inspire the slaves themselves to rise up and demand their freedom, using his presence and the idea of Jedi - associated freedom as a catalyst.
One challenge could be the language difference. Even though English is spoken in both places, the accents and some local slang in England might be confusing for Percy. For example, he might struggle to understand what people mean when they use terms like 'bloke' or 'cheeky'.
One challenge could be the lack of the traditional focus for his magic. Without a wand, he might struggle to direct his magic precisely. For example, when he tries to cast a simple levitation spell, he may end up making objects fly out of control.
He might face challenges like mastering new jutsu. The toads have unique techniques that Naruto has to learn, which could be physically and mentally exhausting.
Obviously, Anakin is a crucial character. The slaves themselves would also be important. There could be a young slave boy or girl who Anakin befriends and who serves as a symbol of hope for the others. And the slave masters, as the antagonists, are important too.
One big challenge could be finding the right location. It needs to be where there's actually water underground. Also, getting the right tools and materials can be tough.
The main challenges include building a platform and getting noticed. It's also hard to stay consistent and motivated. Plus, the market is very competitive, making it tough to stand out.