Leo Mikado is a middle school student from Tatsumiya Island who becomes one of the three new Fafner pilots introduced in the second season of the series. He is described as a short boy who works with his father, Masakazu Mikado, at the family pastry shop called Mikadoya. Leo regularly delivers cakes and Japanese sweets to the cafe Paradise, where he interacts with other residents of the island. His birth date is August 10, 2136.

Leo has a caring and earnest personality, shown through his willingness to help with the family business and his quiet, supportive nature. He harbors a romantic crush on his friend Mimika Mikagami, which adds a gentle, personal dimension to his character. His motivations are rooted in protecting his home and the people he cares about, which drives him to accept the dangerous role of a Fafner pilot when the need arises.

In the story, Leo serves as one of the newer, younger pilots who must grow into the responsibilities of combat against the Festum. He is a close friend of Sui Kaburagi, and together with Mimika, the three form a tight-knit group that supports each other through the trials of war. Over the course of Exodus, Leo develops from a simple pastry delivery boy into a reliable pilot, facing the physical and emotional toll of piloting a Fafner. He continues to play an active role even after the usual retirement age for pilots, demonstrating his dedication and resilience.

Notable abilities include his skill in piloting a Fafner, though specific combat specializations are not highlighted. His background in baking and his modest demeanor contrast sharply with the harsh reality of battle, making him a grounded and relatable figure among Tatsumiya’s defenders.