Quirks increase a player's attributes beyond what you see on their card. Many Quirks are situational - meaning they are applied based on what is happening in the game at that very moment. Quirks are cumulative. For example, if a player has the “Day Player” and “Homebody” quirks, they will see increases for both while playing a day game at home.
For more information on quirks, check out this video by TheScann. We will continue to update this page as additional research about quirks is released.