Characters are defined primarily by Primary Stats ("Attributes"), including Strength, Intelligence, Speed, Endurance, Rank, Courage, Firepower, and Skill. As well, characters have several Secondary Stats ("Traits"), including Armor, Initiative, Structure, Energy, Spark, and Mass Index. Mass Index, one of seven classes, defined how the character interacts with other characters in combat, etc. Characters also profess an Allegiance.
The game assumes players have a working knowledge of standard roleplaying methods.