Sayuri Suizenji serves as a member of the Yellow Gears rescue team in Machine Robo Rescue. She pilots the Gear-Dump transport vehicle and acts as the team's medical specialist. Born in Tokyo on June 26 with blood type O, she is 10 years old at the series' start.

A significant trait is her "therapy natural" ability, enabling her to instill calm in others through conversation; this power is formally recognized during episode 44. Within Yellow Gears, she provides primary backup support alongside Ken Minami.

After the main series, she departs the active rescue team to pursue legislative development. Her focus shifts to creating frameworks and regulations aimed at enhancing the efficiency and responsiveness of International Hyper Rescue operations globally, transitioning from fieldwork to systemic policy contributions.

Her rescue specialization covers underwater and extreme environment operations, aligning with Yellow Gears' mandate. Throughout her involvement, she operates within the organization's hierarchy, contributing directly to missions via transport piloting and on-site medical assistance.