Wow

This is meant to be a parody, isn't it? The characters are rather two-dimensional, and the humor is very much on the slapstick side ...

Senile!Dumbledore is funniest Dumbledore.

please fix this chapter. the Formatring is showing and its unreadable

Yass!
This is amazing!
'Dark Wanker'
I already know I'm gonna love this.
Plus Pandora is always one of my favs when she is in stories.

Also Harry should get a pet snake. Preferably a light and dark gray one. That is big. And very long.
And Luna should get a pet wolf. That has glowing white eyes.
And 'Mione should get a... white phoenix! That can pretend to be an owl.

Pets are always good additions to a story.

So far this book is great and having this trio go back is quite unique.

Story has promise, though it dearly needs a beta reader. Too many typos and other errors. You routinely use whom when you mean who. Whom is not a fancier way of saying who. Who is a subject pronoun; whom is an object pronoun. Always using whom is like always saying Me when you mean I.
My bio page has three short essays on why, why not and how to get a beta; and suggestions for writers.
Good luck!

Nice start