Nietzsche – in this book, he is equally malevolent spirit, joyfully brilliant shitposter, and asshole. The full title is Twilight of the Idols, or, How to Philosophize with a Hammer (Götzen-Dämmerung, oder, Wie man mit dem Hammer philosophiert). It's a dense book – not in that it is complex, but that it is just stuffed with aphorisms and opinions.