Uncle Vernon delegates his dreaded book-work for a self-improvement seminar sponsored by his company onto Harry's list of chores right after the event of Goblet of Fire. What Harry learns in the book sets him on a path of discovery and changes his paradigms for the better. (Vernon is a slightly better human being than canon while the other Dursleys are about the same.) Relationship
Magical Britain has neglected and abused him, and now they're on their own.
RA Black's son raised to be the Lord Black by the reclusive Corbeaux Family and by his Great-grandfather Arcturus Black. In 1994, as he starts Hogwarts as a 7th-year transfer student, he upends life for Harry Potter and the Triwizard Tournament. Expect Weasley bashing. Liam and HP will be overpowered to the levels of LV or APWBD. OC/OC but will end up as Daphne/OC/Fleur.