The Jester Dragon's Guide to Defects (d20)

Publisher's blurb: Even as characters can have Feats that give them particular aptitudes and enhance their various skills and capabilities, so too can they suffer from Defects that negatively affect their ability to function. Such Defects can be used to make games more fun and unpredictable, and even more plausible. The Jester Dragon’s Guide to Defects is a complete sourcebook that details hundreds of character flaws, mental disorders, physical abnormalities, medical conditions, and outright quirks that DMs and players can use to liven up their characters and campaigns.