Mika

Mika is a warrior in the Golden Stag. She prefers to fight unencumbered by heavy armor. Or light armor. Or clothing. Jaquen however, insists that she cover herself, so she armors herself in a chainmail bikini. She told the Iron Heroes that she learned her mobility-focused fighting style in the Serpent's Height's, after being captured and sold to one of the locals for a wife. She didn't like this and attacked him, and, to the amusement of her captors, defeated him. They took a liking to her and taught her their way of fighting(naked), which she still practices when Jaquen isn't looking.