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The Negative Traits Thesaurus

A Writer's Guide to Character Flaws
Angela Ackerman & Becca Puglisi ·2013
“Character flaws are raw material, not obstacles. Understanding them makes characters real and dramatically compelling.”
A reference catalog of 100+ character flaws — each with causes, associated behaviors, challenges, and arc implications. A brainstorming tool for building dimensional characters from their weaknesses up.
A reference catalog: look up a flaw, find its causes, behaviors, and story implications. Brainstorm, don't read cover to cover.
Won't help with: plot, structure, dialogue, pacing, or any craft skill beyond character flaws.
Topics characterconflict
Flaws as Story Machinery
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Key Insights
1 takeaway from this resource — click to expand
💡 Your character's flaw isn't 'controlling.' It's 'was abandoned as a child, concluded that safety requires control, and now micromanages every relationship.' That's not a trait — it's a system. ›
Ackerman and Puglisi map each negative trait through a causal architecture: the emotional wound is the originating event. The wound produces a false belief about the world ('people will leave if I don't hold on tight'). That belief generates a pattern of behavior that the character experiences as necessary but others experience as harmful. The behavior creates consequences that reinforce the belief, forming a closed loop. This matters for writers because a flaw without a causal system is a label — the character is 'selfish' because the author says so. A flaw with a system is a lived reality — the character is selfish because a specific experience taught them that looking out for others gets you hurt, and every selfish act is a logical extension of that lesson. The system is what makes the flaw feel real and the arc feel earned.
Check Your Script
For your protagonist's central flaw, can you trace the chain: wound → false belief → observable behavior → consequences that reinforce the belief? If any link is missing, the flaw is a label rather than a system — and labels don't produce convincing arcs.
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How It Teaches

Encoding fingerprint and cognitive approach

Theory
Examples ›
Example-heavy — each flaw entry includes specific behavioral examples and causes.
Mechanism
Heuristic ›
Heuristic — quick-reference entries designed for immediate brainstorming use.
Diagnostic
Prescriptive ›
Prescriptive — suggests specific behaviors, triggers, and arc possibilities for each flaw.
Global
Local ›
Local — operates at the character and scene level, providing specific behaviors and reactions.
Cognitive Mode
Si + Fi
Teaches through introverted sensing — a comprehensive, catalogued reference of specific behavioral patterns, causes, and manifestations (Si). Evaluated through introverted feeling — each flaw is treated with psychological authenticity, exploring the emotional truth beneath the behavior (Fi).
Si catalogs the specific behaviors; Fi ensures they're psychologically real. Together they make character flaws both usable and authentic.

What It Teaches

Central thesis and key premises

Character flaws are not just obstacles to overcome — they are the raw material of dimensional characters. Each flaw has specific causes, behavioral manifestations, and story implications that, when understood, make characters psychologically real and dramatically compelling.
Teaching Modality
Reference Catalog
Approach
Look up a character flaw, find its causes, behaviors, and story implications. Use it as a brainstorming tool, not a reading-cover-to-cover book.
Character
100+ Catalogued Flaws
Each flaw entry includes: definition, causes (childhood, trauma, learned behavior), associated behaviors, negative effects on the character, and how the flaw challenges relationships and goals.
Character
Flaws Have Causes
Every flaw has a psychological origin — understanding it makes the behavior believable and the character sympathetic even when behaving badly.
Character
Flaw-to-Arc Connection
Each flaw entry suggests how the flaw can drive a character arc — what growth looks like, what resistance looks like, and what failure looks like.
Character
Brainstorming Tool
The catalog is designed for brainstorming, not prescription. Browse flaws to discover character possibilities you hadn't considered.

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