To make a hero truly alive and memorable, it’s not enough to give them only strengths. What gives a character volume and believability are precisely flaws, vulnerabilities, and internal contradictions: they prompt the reader’s empathy and, more importantly, set in motion the internal and external conflict—the main engine of any plot. "The Thesaurus of Negative Character Traits" is a practical guide for writers and screenwriters that helps create multidimensional, realistic heroes. Each example explores the psychology behind a specific shortcoming in detail: its origins (from childhood traumas to mistaken beliefs), typical reactions and behavioral patterns, as well as the thoughts and fears characteristic of a person with that trait. Angela Ackerman and Bekka Pulizzi show how negative qualities are woven into a character’s arc and how—by becoming an obstacle—they can at the same time open the way to growth and inner transformation.