All art, from the paintings on the walls of cave dwellers to art created today, is autobiographical because it comes from the secret place in the soul where imagination resides.
A work of fiction is conceived very much the same way as a dream occurs in the mind of a sleeper.
A work of fiction is conceived very much the same way as a dream occurs in the mind of a sleeper. But a lot of it is imagination. It's not based on real people.