"Hermione Granger and the Serpent's Renaissance" is precisely what you can reasonably hope for a story about 'Hermione wakes up to realize she's the reincarnation of Salazar Slytherin' to be. Such as: — yeah, Salamione is kind of a Mary Sue, though not the annoying sort of Mary Sue, and certainly not the fucking-Tom-Felton kind of Mary Sue, just the "clearly overpowered for the purposes of wish fulfillment" sort of Mary Sue, — no, of course the story gives no serious thought to the implications of a cis man waking up in a female body, let alone to the creep factor of a very old man running around in an 11-year-old girl's body; — yes, politicking involving Lucius Malfoy and Old Families is had, — yes forsooth: boohoo woohoo Slytherin was just misunderstood, he had nothing against mudbloods, oh and Dark Magic isn't evil it's just demonized by the Light Side for no effing good reason boohoo. None of these things are done irritatingly, though. I'm kind of sick of depicting the Dark Arts with a "power isn't evil, men are evil" philosophy, because the Dark Arts are evil in canon. It's the point of them. Dark Arts isn't a random category for powerful magic, it's what you call magic that's evil, whether it's powerful or not. (The Bat-Bogey Hex is canonically, technically, Dark Magic.) But if you start from the premise that the Dark Arts *are* just powerful, dangerous magic, which this story does, then the Dark Arts apology follows naturally from it and you can't sensibly object. It is also a very well-written story, and Hermiazar is the likable kind of Mary Sue, as I said. The kind you can actually have fun imagining yourself in the shoes of, just about. Also, Dumbledore is no ally of Slythergranger, obviously; but neither is he treated as a "manipulative old bastard" or a misguided fool. Salagranger acknowledge that the Light Siders' argument makes sense, especially after a war; it's a political disagreement and no more than that. I have no idea what the flipping hell that weird worldbuilding about souls was about, or why the fuck Slythermione becoming a professional couturier on the side is a prominent subplot. But that doesn't detract from the story being fundamentally a charming bit of fun. 4/5. If this website allowed for half-points I might persuaded to give it 4.5, though then again perhaps not.
I am thoroughly enjoying this series. My only complaint is that Hermione tells everyone to call her Sally. It might be better if she goes under the alias while trying to change the magical society for the better. Other than that Salazar/Sally is trying to prevent redoing past mistakes. Like canon, she helps Harry while minimizing the dangers or foolishness.