From TactWiki

Each race in game has a preference for a certain expression type. Special race-only cards are earned in the tutorial and intro quests and are a starting diplomats most potent cards available. These include a 5 point Assertion card as well as supporting evaluations to fuel the racial specialty.

Here's a quick breakdown, taken from Dacian's excellent diplomacy guide ([1])

The choice of adventuring class also has an impact on the initial deck a diplomat starts out with. Like race, each class also has a preferred expression type, which determines which comments are learned by a new diplomat.

The Cards

Comments
Diplomats all start with the basic Snippet of Wisdom comment. Additional starting comments are determined by a diplomat's class and racial Expression preferences. These determine which 1 Influence comment cards are earned when starting out.

Assertions
Every starting diplomat gets a 3 Influence Assertion for each expression type. These four cards are Aggressive Statement, Itemized Comparison, Loud Criticism and Enticing Whisper.

Each race receives additonal Assertions based on their racial preference, including a strong 5 Influence Assertion card:

An additional 4 Influence Assertion is given based on racial expression preference:

Demand: Flurry of Arguments
Reason: Infallible Proof
Inspire: Slippery Slope
Flattery: Catch Phrase

Multi-expression Assertions
Each expression category also receives a card that uses multiple expression types, based on their strongest parley type. These cards a earned towards the end of the introductory diplomacy quest line in each starting city.

Demand: Resolution
Reason: Absolution
Inspire: Elocution
Flattery: Disillusion

Rebuttals
Each race gets a specific rebuttal during the starter quest, with an option to choose a second.

==Racial Cards==
Each race gets a card unique to them.