Sometimes it is good to write a profile for each character. The following is a list of headings for you to copy and paste into a document. I hope you find it useful.
Heredity (the passing on of physical or mental characteristics genetically from one generation to another):
Sex Life and Moral Standards:
Personality (extrovert, introvert):
Attitude toward life:
Every story you write has its own set of laws as absolute as physics. Your world may be in the 1880s, or the 1920s. It is not just a matter of what kind of transport was commonly available, or what was served in a restaurant. Your world covers everything from fashion to technology. Nail it down. Be consistent. Everything you write has to fit into a larger whole and no single element must violate the rules of your creation.
Write about those moments you never forget.
Don’t just react emotionally to old memories. Capture and interrogate them to find another layer of meaning.