You have a lot of runoff sentences in the story I really hope you find an editor or proofreader

I honestly think it's great keep up the good work

"My quirk is called hardening it's a transformation-type Quirks it allow the user to temporarily "transform" their body in a variety of manners, sometimes enhancing existing features, removing features, or adding new features to the body altogether. ... Some users condition their body in certain ways so that their Quirk can operate more effectively" I said finish before looking back at Fluttershy and walking up to her.

Is that last part true?

Recently in the manga, it was made canon that a weakness of One For All is that if a wielder already has a Quirk, their life span will be shortened.

But in a world of magic I can see how your MC would be able to find a way around that weakness.

"Hello my name is princess Celestia and this are my fellow princesses Luna, Cadence, and Twilight along with the elements bearers Pinkie pie, Applejack, Rarity Belle, Fluttershy and Rainbow Dash" she said with a motherly smile.

But where's Spike though?
Why did he miss out on meeting Red Riot?