And also, what? Just being terrible on academics on her own isn't enough to count as a character flaw unless she also makes everyone else stupid, too?
How are you even defining "character"? That complaint is based on the idea that Haruko inside Natsuko's body as the exact same character as Natsuko being herself, and I can't even imagine the twisted logic required to come to that conclusion.
What the hell are you smoking? What the hell are you even reading? It seems to be an entirely different series, because I haven't seen a single comment of yours anywhere on this series where your criticism has anything to do with anything that has ever actually occurred anywhere in the comic.