A few good books to do a literary essay on are:
Artemis Fowl
Percy Jackson
Books like these you can never truly have a wrong answer. As there are multiple themes or big ideas.
A literary essay is an academic assignment that examines and evaluates a work of literature or a given aspect of a specific literary piece. It tells about the big idea or theme of a book you've read. The literary essaymay be about any book or any literary topic imaginable.
Those are large chapter books a part of a series [which is SOOO good in my opinion].
But your essay can be about ANY BOOK as long as it has a big idea or main theme.