A fan made a blog about the Leaderheads and Traits for Version 32.
As manual for a custom game start and documentation, i took screenshots of all the Leaderheads in Civ 4 Caveman2Cosmos which their according tooltip visible. Whenever you start a new custom game, you need to select your Leader, who has pros and cons in form of traits. Those define if e.g. a Leader is Industrious, Aggressive, Protective or Megalomanic, and also you can review from which culture a Nation derives from. This Manual is for the current Caveman2Cosmos Version 32.
To view The Leaderheads and their Traits, please visit the link below.
Ninc.at
Someone must ask blog owner if he can update the traits, or someone do that plz!
Go to Cavveman2Cosmos forums