강철희 (Gangcheol-hee) - Gangcheol meaning "strong steel," Hee meaning "bright" or "shining."

검은별 (Geomeunbyeol) - Geomeun meaning "black," Byeol meaning "star."

폭풍소희 (Pokpungsohee) - Pokpung meaning "storm," Sohee meaning "clear" or "bright."

독수리윤 (Doksuriyun) - Doksuri meaning "eagle," Yun meaning "cloud."

불꽃지혜 (Bulkkotjihye) - Bulkkot meaning "flame," Jihye meaning "wisdom."

철벽서윤 (Cheolbyeokseoyun) - Cheolbyeok meaning "iron wall," Seoyun meaning "clear cloud."

암흑진아 (Amheokjina) - Amheok meaning "darkness," Jina meaning "truth."

용맹하나 (Yongmenghana) - Yongmaeng meaning "brave," Hana meaning "one" or "single."

칼날수현 (Kallan suh-hyeon) - Kallan meaning "blade," Suhyun meaning "excellent" or "outstanding."

야차혜인 (Yachahye-in) - Yacha meaning "ogre" (a powerful being), Hyein meaning "grace" or "kindness," creating a contrast.

Note: The meanings provided are approximations and the overall "badass" feel is subjective and depends on cultural interpretation. These names combine strong imagery with traditionally feminine names to achieve the desired effect.