Maybe it opens up new adventures for him. He could use the knowledge to explore hidden places or get into unexpected situations. Also, it might cause some trouble as others might try to get the book from him.
Well, it could lead Harry to master the Appari skill quickly and use it to solve some urgent problems.
Well, it could lead to Harry practicing apparition secretly and getting into all sorts of adventures and mishaps.
Well, in the fanfiction, Harry might first try to find the owner of the cat. He could use magic to see if there are any identification spells on the cat. Then, he might take it to Hogwarts. The cat could be a magical cat with special abilities, like being able to talk or lead Harry to a hidden place in the school.
Well, it depends on the specific fanfiction. But generally, Harry could encounter some sort of magical trial or test in Godrick Chambers. For example, he might have to prove his worthiness as a Gryffindor by facing challenges that test his courage, intelligence, and loyalty. And perhaps he meets the spirit of Godrick Gryffindor who gives him some crucial advice or power.
Well, it could lead to him seeking help from a magical healer or professor. Maybe it triggers some hidden power within him.
Well, if Harry Potter finds Excalibur, it could completely change the wizarding world. He might gain some new powers from the sword. Maybe he could use it to defeat Voldemort in a more epic way than with his own wand. It could also bring a new alliance between the wizarding world and some other magical beings who respect the power of Excalibur.
Well, it might inspire Harry to explore his emotions more deeply and have a greater appreciation for literature. This could also potentially affect his relationships with others at Smeltings.
Well, in a story like this, Harry might first be really surprised to find the Pokemon egg. He'd probably try to figure out what it is. Maybe he takes it to his friends, like Hermione and Ron, and they all start researching about it together. They could be confused because Pokemon eggs are not from their world. Then, as the story progresses, the egg might hatch and out comes a cute little Pokemon. Harry would then have to learn how to take care of it.
Well, he might discover a whole new world of magic in that fanfiction. Maybe it contains spells that are not in the original books. He could get inspired to try out new things or it could even lead him to new adventures within the Hogwarts library, like finding a hidden section related to the ideas in the fanfiction.
Well, in many cases, Bill might try to rescue Harry from the abusive situation. He could confront the abuser or find a way to get Harry to a safe place. Maybe he'd also offer emotional support to Harry, like listening to his story and reassuring him that he's not alone.
Well, often Harry will enter the Room of Requirement in fanfiction and find it full of secrets related to his family. Maybe there are portraits of his ancestors or diaries that reveal important family history and give him new insights into his own powers and destiny.