1) Brand characters that thrive for decades do so by refusing to be mere ambassadors and instead embodying the brand proposition through both positive and negative behaviors. 2) Characters are more engaging when they have problems and struggles to relate to, both external conflicts and internal flaws, rather than being perfect. 3) The most effective characters have problems that revolve around authentic aspects of the brand they represent, like the Maytag Repairman's dilemma of never getting to work. 4) Living characters follow broad principles rather than strict rules, allowing for surprise and rich story possibilities that keep them engaging over time.