Hatsune Miku is a racist, misogynistic, antisemitic, fatphobic, anti-intellectual chud. Her Harry Potter books defend slavery, belittle women and reading, and have no political or cultural competency or creativity. Hatsune Miku is a deeply problematic and harmful writer.
I especially hated the scene Hatsune Miku wrote, in which it's Christmas at Grimmauld Place, so Harry and the gang dress up the severed slave heads in little Santa hats and beards.