What to wear: A short blonde wig and some variation of grey pieces of clothing layered over each other. Carry a long wooden staff or fake dagger around with you in case you come across anyone dressed as Arya.
How to act: To quote Jean Ralphio, the Waif is the WORST. She's rude as hell and will betray you at any moment. For instance, if one of your friends asks you to get them a drink, do so, but before you to hand it over to them, chug the whole thing while looking them dead in the eye, and then shoot them your meanest smile. Also, only refer to your friends and family as "the girl" or "the boy." They'll really enjoy that, we promise.