Mōkaku is a leader of Nanban High School alongside her sister Moyu. Before the events of the fourth season, the two sisters attempted to conquer the entire Kanto region, but their campaign was halted by the emergence of the heads of Nanyo, Seito, and Kyosho schools. In Xtreme Xecutor, Mōkaku forms an alliance with Kentei and finds herself in battle against Chouhi Ekitoku.

In terms of personality, Mōkaku is notably condescending and frequently ends her sentences with the insult bakayarou. She wears a revealing outfit consisting of a yellow sleeveless jacket that exposes her bra, yellow shorts, a yellow peak hat, and yellow boots. Her preferred weapon is a modified Chinese ring, which she uses both for hand-to-hand combat and as a throwing implement.

Mōkaku's motivations are initially driven by the ambition for conquest and dominance over the Kanto region. However, as the story progresses, she and her sister Moyu undergo a significant change of heart. After experiencing defeat and engaging with other fighters, they decide to reconsider their approach to both life and competition. This development culminates in their departure after the eleventh episode, leaving the ongoing conflict behind.

Her key relationships center on her bond with her sister Moyu, with whom she acts in tandem throughout most of the story. Her interactions with other major fighters, particularly her clash with Chouhi Ekitoku, highlight her combative nature and serve as catalysts for her later shift in perspective.

Mōkaku's fighting ability is characterized by her aggressive and challenging style, making use of her ring weapon to engage opponents both at close range and from a distance. Her role in the story is that of an antagonist who eventually reconsiders her priorities, providing a subplot about the possibility of breaking away from a cycle of endless combat.