The fundamental units of any story are the characters in it, and roleplaying games are no different. d20A provides the tools you need to create almost any character you can imagine. The Character Modules give you plenty of options to create exactly the character you want. This Characters Core provides the foundation for character creation with the absolute essentials for making your character, regardless of what sort of game you're going to be playing in. Other games might add options from other Character Modules, depending on the game's genre and the group's preferences.