Well, in this type of fanfiction, the power dynamics in the wizarding world are likely to be completely different. Harry's all - powerful state might lead to a shift in the balance of power between the good and the bad. The Death Eaters or other dark forces would have to come up with new strategies to deal with him. And from a creative point of view, the author has a lot of room to play with different storylines. They can create unique challenges for Harry, even though he's all - powerful, like moral dilemmas that test his newfound abilities.
In 'harry is all powerful fanfiction', a cool thing is how it can explore different magical concepts. Harry being all - powerful means he can delve into the deepest secrets of magic. He could, for instance, discover new forms of magic that are not part of the traditional wizarding curriculum. Also, it's interesting to think about how the power would affect his personality. Would he become more arrogant or would he remain the humble Harry we know? It could show a great character development journey.
One interesting aspect could be seeing how Harry uses his all - powerful abilities to reshape the wizarding world. For example, he might be able to completely change the way Hogwarts is run, perhaps introducing new classes or magical techniques that were previously unknown. Another aspect could be his relationships with other characters. Since he's all - powerful, his interactions with friends like Ron and Hermione could take on a whole new dynamic, with him being able to protect them in ways that were unimaginable before.