Goei is the widowed mother of Hakufu Sonsaku, the main protagonist, and resides with her daughter and nephew Koukin Shuuyu. Her character is defined by a striking duality; she often presents herself as a flirtatious, promiscuous, and seemingly carefree woman who enjoys drinking. However, beneath this frivolous exterior lies a surprisingly cunning and strict individual who is a formidable fighter in her own right.

Goei is a devoted parent who actively pushed Hakufu to embrace her destiny as a fighter, believing in her daughter's potential. She maintains a boisterous and loving household, though her relationship with Hakufu is defined by a constant, playful conflict. She is quick to punish her daughter for disobedience, particularly in response to being called an "old hag," a term which serves as a significant berserk button for her. This dislike of being reminded of her age is a consistent and defining personality trait.

In the story of Dragon Destiny, Goei primarily serves as a supporting character and a source of stability at home. While not a central figure in the political conflicts between the rival schools, her presence is felt as a protector and advisor. She participates in key moments, such as when she joins Ryomou and Koukin in contemplating the dangerous fate that could befall Hakufu should her powerful dragon spirit fully awaken. Her primary motivation is the well-being and success of her daughter, intervening when necessary to ensure Hakufu is prepared for the challenges ahead.

Information regarding any significant character development or a wide range of key relationships beyond her immediate family is limited. Her role is largely consistent, acting as a strong maternal figure whose past as a widow is acknowledged but not deeply explored. Her notable ability, in addition to her combat skills, is her proficiency as a chef, preparing excellent meals for her household, which contrasts with her image as a hard-drinking and flirtatious woman.