Personality is a roleplaying mechanic that affects a character's interactions with NPCs in the world. The initial personality is determined by how the player answers biography questions during character creation and is refined by the most recent 100 encounters with particular NPCs.
The game keeps track of three aspects of personality: Charisma,Ferocity and Dignity, whose sum is 100%. Dialogue choices can affect the personality by increasing one aspect and thereby decreasing the others.
Personality affects gameplay by offering certain dialogue options only to some types and altering the reactions of certain NPCs. However, the game is designed to avoid extreme consequences, i.e. players are able to take on different personality types without fear of losing out on overall rewards or benefits.
There are 10 different personalities available. The personality icon is next to the class icon on the hero panel and shows which personality the character currently has.