My knowledge of it is somewhat limited to the pagemaster movie because i never read it.

anyhow, long story short, he is one way and then he takes this potion and becomes someone completely different.

I feel like that sometimes.

Has anyone ever done analysis of books from a psychological perspective and diagnose whatever character it is as though they had a real life disorder?

no

i've read this book in english and it was boring ^^
And i didn't do an analysis