The document provides tips and techniques for writing player characters in games. It discusses: 1) Types of player characters including cipher characters with no personality, fixed characters with set backstories and abilities, and customizable characters where players define the character. 2) The balance between player agency, which allows player actions to affect the experience, and authorship where writers control authored stories with limited agency. 3) Tools that bring characters to life including character profiles, psychology, concept art, animation and cinematics. 4) Questions to consider when defining characters such as their purpose, traits, abilities, knowledge, governing traits and flaws. 5) Tips for creating diverse characters including avoiding stereotypes, focusing