Miss X serves as the boss of the Global Wrestling Monopoly (GWM) and the manager of the Tiger's Den, the training and management arm of the organization. She presents herself as a beautiful and deadly woman with a strong physique, very long blonde hair, and blue eyes. Her role in the story is that of the primary antagonist on the corporate side, overseeing GWM's operations and its roster of heel wrestlers. Unlike the more overtly conquering and violent approach of Mister X from the original Tiger Mask series, Miss X is driven first and foremost by business concerns. She consistently prioritizes the profits and reputation of GWM, viewing conflicts and even Tiger Mask's interference primarily through the lens of financial and promotional gain. She is willing to use underhanded tactics to further her organization, such as binding Naoto Azuma to a contract that forces him to betray New Japan Pro-Wrestling in exchange for a title match, but she also treats wrestlers as assets to be exploited rather than personal vendettas to be settled.

Miss X is not merely a manager; she is also a capable fighter who competes under the ring name X Woman, and she does so without wearing a mask. She is a skilled wrestler and is known to use a whip as a weapon. Despite her confidence, she considers Tiger Mask an enemy and is, at times, overwhelmed by his power and determination.

Her key relationships include her antagonistic stance toward Tiger Mask, her role as the overseer of the champion wrestler known as The Third, and her professional dealings with the other members of GWM. Throughout the series, she maintains a calculating and pragmatic demeanor. After GWM's eventual financial downfall and defeat at the hands of Tiger Mask and his allies, Miss X adapts and founds a new organization, the Girls Wrestling Movement, also abbreviated as GWM. In this new venture, she recruits Haruna Takaoka, who initially wrestles as Spring Tiger and then as Springer, to become the central figure of her women's wrestling promotion. This final development highlights her resilience and her relentless focus on continuing her wrestling enterprise under a new banner.