Michiru Saotome is the daughter of Dr. Saotome and serves as a major supporting character across multiple iterations of the Getter Robo franchise. In the original television series, she is depicted as a beautiful and strong-willed young woman with short brown hair, brown eyes, and a distinctive headband. She pilots her own jet, which does not combine with the Getter Robo machines but instead provides resupplies of fuel and energy to the team during combat. Her role is primarily that of a capable support pilot and a grounding presence at the Saotome Institute.

Her personality in the early anime is genuinely friendly, polite, and approachable, earning her the nickname the Madonna of Asama High and drawing admiration from several characters, including Musashi Tomoe. Despite the romantic interest shown by all four of the Getter Robo and Getter Robo G pilots, her feelings are not mutual, and she maintains a cordial but platonic relationship with each of them. In later series, her characterization shifts. In Shin Getter Robo, she appears cooler and more stern, with strained relationships not only with the Getter Team but also with her father. In New Getter Robo, she is older, has a much shorter temper, and prioritizes the scientific study of the Oni over direct combat, demonstrating a scholarly inclination toward understanding the enemy.

Motivations vary by incarnation. In the original anime, she is driven by a desire to help her father and protect humanity from the Dinosaur Empire and later the Hyakki Empire. In versions where she leans toward research, she is motivated by curiosity and the need for knowledge to counter threats. Her key relationships center on her father, Dr. Saotome, and the Getter pilots—Ryoma Nagare, Hayato Jin, Musashi Tomoe, and Benkei Kuruma—with whom she works closely despite occasional friction. Her death in the backstory of Getter Robo Armageddon becomes a crucial plot point that deeply affects the team and fuels the narrative of that series.

Notable abilities include advanced expertise in biology, particularly Oni physiology and behavior, gained through direct sample collection and battlefield analysis. She also contributes to mechanical and energy-based advancements, aiding in upgrades to the Getter Robo's systems. In the original anime, her piloting skills allow her to operate a dedicated support jet effectively, ensuring the Getter Team can sustain prolonged engagements. Across her different appearances, Michiru Saotome remains a steadfast figure whose blend of scientific insight, piloting capability, and evolving personality makes her an integral part of the Getter Robo saga.