Daddy
I honestly don't understand why the dumbledor didn't tell him about his family, it's also kind of annoying this density of Japanese MC, it seems like it's what I read in the comments forced plot for hatred against pure-blood wizards, if all pure-blood wizards were really prejudiced, so even without voldmort Harry would have lost, and considering that most of Harry's allies were pure-blood wizards and of the circle of closest people only Hermione was Muggle-born, then I consider it ridiculous to say in such a general way that all Purebloods are evil.
i liked the story so far, but it's hard to believe that if he did so well in school he didn't get a job, for example Tom Riddle was invited to work in the ministry when he graduated from hogwarts, remembering that everyone thought he was a Muggle-born, also being honest there aren't enough pure-bloods to cover all the jobs in the Ministry so if he did well in school I don't see the point in him not having work, it just seems like you want to give the protagonist a reason not to like it of thoroughbreds
That first part was pure cringe reading it, if you had your MC that reaction, which is understandable, shouldn't have included that part from Dumby. Best case the reader understands the MC, it adds nothing to the story, worse case the MC looks like an idiot, weak and somewhat pathetic that a portkey affects him so badly, so much for the body, mind soul + his combat magic abilities. I do hope this is not one of those were system stats have no relation or effect on reality.