Too pretty to die (3.5e Trait)
From D&D Wiki
 Too Pretty to Die
You are so charismatic that the fates have seen fit to make people almost unwilling to strike you...almost.
Prerequisite: Charisma 20+
Benefit: You use your Charisma bonus instead of your Constitution modifier to determine HP, and your Charisma bonus instead of your Dexterity modifier for AC.
Drawback: Due to your obvious cockiness from your odd resistance to harm, you receive a -6 penalty to Diplomacy and Gather Information checks.
Roleplaying Ideas: Cockiness, complete and utter cockiness.