Philosophy

Someone once said that philosopher is a failed writer: you wouldn't do philosophy if you are talented enough to write a good novel.

From the lens of writing almost every novel has bits and pieces of author's philosophy. However, in modern world there's not a lot of demand for modern philosophy (same as with other deep academic field).

Consider how many novels were written about gas thermodynamics? About zero and the reason is simple: there's little demand for it to afford hundreds of hours of professional writer

I would argue any good faith fictional novel is in and of itself an expression of a philosophy held by the author. The words and phrases one chooses to describe the scenery, characters, and plot come from their experiences of the world. The themes that appear can be regarded as the author’s philosophical approach to the situations. By good faith I mean a novel written with the intent of communicating a story or idea, not one written out of pure intent to profit.

Consider the, now somewhat cliche, author George Orwell. Though not a philosopher by trade, the collective themes of his novels revolve around the causes and effects of totalitarianism (a political philosophy). Yet clearly the presentation of his works is not in an objective manner, he is not presenting mere facts about totalitarian regimes. He uses a strong negative connotation, and uses the idea it is something to be avoided. This implies a political philosophy of anti-totalitarianism. I think you could make a similar argument for modern popular author’s like John Green.