From TactWiki
Overview
Expression is the representation of the four ways you can “influence” NPCs. The four expression types are Demand 
, Reason 
, Inspire 
and Flattery 
. During a parley, expression is represented by small colored dots on the game board which you can spend using statement cards.
Player Expression
Player starting expressions are determined by their race and class. For more information see Starting Cards: Race and Class Expression Types.
Player Race Expression
Player Class Expression
NPC Expression
The expressions used by Civic Diplomacy NPCs are generally determined by their race and station. The following tables can be an initial guide to deck design for parleying NPCs with the caveat that individual NPC decks can vary greatly.
NPC Race Expression
NPC Station Expression
Thus, an Orc Clergy would be expected to have a deck comprised primarily of Demand and Inspire.
Conversation Expression
Some types of conversations block one expression during parleying. Interview does not block any expressions.
