Mio Sakamoto is a central character in the Strike Witches series, serving as the first Strike Witch and the battle commander of the 501st Joint Fighter Wing with the rank of Major. She originates from the Fuso Empire and is a veteran of the early conflicts against the Neuroi, the alien threat that drives the story. At nineteen years old at the start of the series, she is the oldest witch in the unit, and by the second season she turns twenty. Mio is one of the first witches to pilot a Striker Unit, having known Yoshika Miyafuji’s father during the initial development of the technology. Her role in the story is that of a mentor and strict instructor, especially toward new recruits like Yoshika. She is known for her rigorous training methods and a no-nonsense attitude in combat, which is reflected in her familiar taking the form of a Doberman when she equips her Striker. Despite her sternness, Mio is fundamentally friendly and approachable, often displaying a warm, if sometimes forward, personality and a distinctive laugh. She is driven by a strong sense of duty and a desire to protect others, having witnessed the devastation of the Neuroi war firsthand. A notable physical trait is the eyepatch she wears, which conceals a magical eye that grants her enhanced visual abilities, allowing her to spot the core of a Neuroi even through heavy defenses. However, because her magical power has naturally diminished with age, she is no longer able to erect effective magical shields in combat, relying instead on her experience, a 13mm Type99 machine gun, and a magical katana that can cut through large Neuroi. Her personal growth involves coming to terms with her own limitations and learning to trust her younger squadmates, particularly Yoshika, whose latent potential she helps nurture. Key relationships include her close bond with Yoshika, whom she recruits and trains, and her role as the second-in-command to Minna-Dietlinde Wilcke. Mio’s development sees her move from a solitary veteran focused on fighting alone to a leader who values teamwork and the next generation of witches. Her Striker Unit is originally based on the A6M Zero, later replaced by a model inspired by the Kyushu J7W1 Shinden.