Asuka Sugo, daughter of Kojirou Sugo (President of Sugo Corporation and former Cyber Formula racer), shares a childhood friendship with Hayato Kazami rooted in their fathers' bond. Her brother's long absence remains a source of concern. Holding the deputy owner position for the Sugo Asurada racing team, she initially serves as a mascot wearing tight-fitting grid girl outfits before taking on team manager duties.

Her relationship with Hayato deepens over racing seasons, culminating in romance by the end of 2015. Following Hayato's severe accident early in 2017, Asuka supports his recovery, and they become engaged during rehabilitation. She later breaks off the engagement after Hayato breaks a retirement promise, distancing herself from him and the team. Encouraged by friends Miki and Claire, she gradually returns to the racing world. Hayato proposes again before the ZERO season's final race, which she accepts.

Passing the transfer examination for Columbia University, Asuka moves to the United States after the final race to pursue a medical career. She and Hayato marry by the conclusion of the SIN season.

Cooking is her special skill, reportedly improving despite initial challenges. Her leisure activity is shopping, and she is characterized as a poor driver. Her blood type is O and her birthday is March 14, 1999. Asuka provides crucial emotional support to Hayato throughout his racing career, though her concern for his safety sometimes strains their relationship.