The stage seems to be set for a sequel adventure series, The Three Immortals. Three great heroes, each blessed with a fragment of immortality, work together to fend off the forces of destruction and bring true immortality to all of humanity.

Unicorn Girl, filled with the life-giving, regenerative powers of two noble magical creatures. Her mind captures everything that she sees, with amazing fidelity, while the purity of her heart pulls her to do what's right with similar fidelity. Some call her "mudblood", in honor of the ancient myths about the creation of man from earth, because the power to re-create herself flows continuously through her veins.

Mr. Physics, the culmination of the great Peverall line which has sought immortality for generations, is the heir to many great and powerful magical artifacts. But it is his deep and detailed knowledge of the laws of the universe which grants him his greatest power - the power to make anything out of anything, even reshaping his own body. He has made a solemn vow to protect humanity, with Unicorn Girl as his moral compass.

The mysterious Cloud has dark secrets which are hidden even from himself, but his mind still holds a wealth of ancient lore to share and an intellect so sharp it can cut through any facade or riddle... except perhaps his own past. This great mind is backed up, a hundred times over, in a vast network which allows him to be reborn in full force should his body ever fail him. The first to reach immortality, Cloud helped bring both his companions into their powers.

Doesn't this also apply to Baba Yaga?

The Ravenclaw team put up a valiant fight.

But there was no Quidditch team anywhere that could've defeated the Slytherins that day.

Dawn was tinging the sky when the Slytherins won their final game, the Quidditch Cup, and the House Cup.

I read this as metaphorical, with Harry the Slytherin-just-kidding-Ravenclaw going Slytherin, but I don't see exactly how that fits.

Hermione is a rule follower. She wouldn't destroy Azkaban if she had a button she could press that would do so.

She also knows exactly what it's like to be an innocent sentenced to Azkaban for a crime they didn't commit, and how easy it is for such a thing to happen. You can't go through an experience like that without re-evaluating some things about how you see the world.

Also she can't kill even one Dementor, or even cast a patronus to prevent one from killing her.

The point of the above post, I believe, is that there is nothing stopping her from learning to cast Patronus 2.0, at which point it's plausible that the infinite unicorn blood would replenish her life-force so killing Dementors wouldn't end up draining it all.

I'm not sure how Quirrell's last plot could still come to fruition. Slytherin have won the house cup and one of the professors awarding house points to Ravenclaw at this stage would feel like Quirrell's plotting had failed.

Harry can always do with the ring what Voldemort did with the Horcruxes and ensure it is lost forever.

He can’t, unless he wants to visit one of the suggested hiding places several times a day:

"Sustaining a Transfiguration is a constant drain on your magic which scales with the size of the target form. And you would need to recontact the target every few hours

(McGonagall, chapter 15)

Professor Quirrell will always be a step ahead of you, will always outwit you. You cannot beat him in any game.

That is the characterization of the Defense Professor. A story cannot start with "You can't beat the Professor Quirrell at any game" and end with "Professor Quirrell has lost the game" without a character break in between.

Besides all the foreshadowing about Quirrell's plan being to lose a battle to Harry, isn't it rather convenient that Quirrell just happens to arrange for Harry to learn the spell that Harry uses to defeat him?

So... Quirrel told McGonagal that he was David Munroe, and it was implied with Madam Bones. It looks like David Munroe was killed in a battle with Voldemort, ending that noble and most ancient line, which has now been avenged by Hermione destroying Voldemort with her magic Girl-Who-Lived powers.

Are we going to get the Noble House of Granger? Does the House of Potter lose its noble status since David Munroe was apparently not previously dead to be avenged by Harry? Will they both be noble because the Wizengamot doesn't know what to do with the ambiguity?

Am I wrong in thinking that Voldemort had given his gun to one of the Death Eaters, and so Harry should not be seeing it fall alongside Voldemort's wand when he cuts his hands off?