Miki Makimura is a late-teen girl with short brown hair, brown eyes, and a wardrobe blending casual and school attire: a blue mini skirt, pink top, pink hairband, and a blue-and-white sailor uniform. Her personality balances gentle warmth, playful humor, and steadfast responsibility, most visible in her protective care for her younger brother, Kensaku "Tare" Makimura, during their parents’ absence. She shares a deeply affectionate bond with Akira Fudo, grounding him emotionally as chaos from widespread demonic hysteria escalates.

Living in a world where demons’ existence sparks global panic, Miki’s life fractures after a bus ride disrupted by an attack. Returning home to find Akira missing and her father consumed by demon-hunting, she later faces a mob incited by Ryo Asuka’s broadcast targeting her family. Her desperate defense ends in tragedy—her brother slain and her head impaled on a pike. This brutality triggers Akira’s violent metamorphosis into Devilman and mental collapse, allowing the demon Amon to seize control. Her death lingers in Akira’s psyche, her unwavering love and absence of blame haunting his struggle to reclaim humanity from Amon’s grip.

Across adaptations, including the original manga where she is Akira’s childhood friend and housemate, Miki’s death catalyzes his disillusionment with humanity and escalation against demonic forces. Versions like *Devilman Crybaby* frame her within themes of societal collapse, though her demise consistently propels the narrative. A symbolic baton pass in *Crybaby* underscores her legacy as an enduring emblem of empathy, even as her killing deepens the rift between Akira and Ryo.

Her arc universally examines loss, societal paranoia, and fragile human connections. While her relationship with Akira shifts between platonic loyalty and romantic devotion depending on the adaptation, she remains his moral compass and emotional foundation, shaping his transformation from vulnerable youth to a tormented hybrid warrior straddling humanity and demonic fury.