A resident of Ritona, Jeeha's neighboring village, Yoko Littner tracks down the Gunmen which crashed through the surface and into Jeeha. She is highly knowledgeable in combat fighting and provide wise counsel to advance the war of liberation, even if her choice of clothing seem to speak otherwise. She explains earlier on in the series that she avoids clothing that restrict her movements.
I don't know about her, but I know I would find it difficult to fight in short shorts and a bikini top. Then again, she's the expert, not me. Thanks again to MPzero for the wonderful photography!