Your costume suggestion
You are a vision of knighthood, dressed in a red and gold tabard and leggings with matching shield. You regularly check the shine of your recently shorn locks with a small hand mirror.
A knight in King Toffrey's service, you've lived a life of being chosen second . . . for everything. You can't imagine why. Your shimmering blond hair and sparkling white teeth you should have made you a shoe-in for every promotion. Still, your recent dragon-slaying endeavours should see you well rewarded.
INTRODUCE YOURSELF AT THE START OF THE GAME BY READING THIS
My name is Sir Prancelot. I am a knight in the King’s service - or at least, I was, until earlier today. It doesn’t matter - soon I’ll be “Lord” Prancelot as befits my [strike a pose] many talents. In my spare time, I enjoy long walks on the battlefield, slaying dragons, and ravishing, I mean rescuing, the odd damsel. My parents live in a far off land that we don't need to talk about.