The Delicate Art of Character Folding,by Rebecca Makkai, explains the idea behind converting multiple characters into a single person. To begin with, Rebecca felt the need totrim the number of characters in a novel she was writing.
You'll find a wealth of information by studying The Delicate Art of Character Folding, published May 13th in The Masters Review Blog, whose mission is to support emerging writers.
Rebecca Makkai is the Chicago-based author of the short story collection Music for Wartime, and of the novels The Hundred-Year House, and The Borrower, a Booklist Top Ten Debut which has been translated into eight languages. She's also taught at the Iowa Writers Workshop, Tin House, and Northwestern University.