Proud (3.5e Trait)
From D&D Wiki
You are very prideful in who you are and what you do.
Benefit: Once per day you can add your Cha modifier to any social interaction skill roll.
Drawback: You have a need to show-off your persona. Once per day you must be vigilant about yourself or your goal(s) in life explaining them to someone new. If you don't do this you must make a will save (18 DC) or gain a -2 on all social interactions for 24 hours.
Roleplaying Ideas: You feel it is your duty to let anyone or everyone know who you are or what you are doing in life for your goals. You don't follow this with a narcissistic act, as you may also include your party, your patron god, or even your king in the explanation.