Miss X (ミスX Musu X?) / X Woman (Xウーマン X Ūman?) is the main antagonist of the series, Tiger Mask W.
Boss of GWM and the manager of Tiger's Den, a beautiful yet deadly woman who works under Mister X. She has a strong physique and fights under the name X Woman, albeit she does so unmasked. She has no defined technique but is a strong fighter.