Writeups.org is an encyclopaedia of characters in genre fiction — comic books, video games, action movies, etc. It offers illustrated, researched profiles. These also include technical data for role-players. If you need a robust understanding of a character’s abilities, personality, history, etc. this is *the* place to be.
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A writeup of the Assassin character class in Diablo II, information about assassins in this game world, and an example of possible background and characterization to flesh out the archetype.