The myth of the perfect leadership personality: who wants a template leader anyway?

We were asked by the CEO of a major organisation if he could use our Character Analysis as part of his drive to better understand his people. We kind of like this as it helps spread the word that business is a people game, and a contact sport. We asked how he intended to use the assessments: "Well I want to make sure we only hire ENTJs." We asked why he would want to do that: "Because they are the best types." We asked what type he was (we were being ironic). But it does raise a serious issue: often managers want to clone, ie recruit and develop in their own image.
So much is written about leadership and it does all tend to veer towards the charismatic, extravert, individual pointing upwards with everybody in awe. In reality we know this isn't right but it fits with the myths of leadership as being Caesar crossing the Rubicon.