Suen is the personal assistant to Cleopatra Corns, leader of the Corns Conglomerate, providing a pragmatic counterbalance to Cleopatra's impulsive and adventurous tendencies. She consistently advises caution and emphasizes practical considerations during missions, expressing concerns about potential dangers and logistical challenges when Cleopatra intervenes in high-risk situations.

Her responsibilities encompass managing operational details for the conglomerate, including coordinating transportation, communications, and resource allocation. She directs other team members, such as instructing Nacky to travel to Saudi Arabia for a mission and handling subsequent coordination. Suen participates directly in field operations alongside Cleopatra, though she occasionally shows reluctance in socially uncomfortable scenarios, preferring discretion during undercover activities like wearing revealing outfits.

Suen shares a close, informal relationship with Cleopatra, marked by mutual trust and frequent companionship. Personal moments, such as sharing a bath in the anime adaptation, illustrate their day-to-day intimacy beyond professional duties. Visually, Suen is distinguished by a hairstyle that partially covers one eye, with the eye remaining visible beneath her hair. Her role remains consistently focused on supporting Cleopatra through administrative competence and field involvement.