OVA
Description
Miko Mido stands as the central protagonist throughout the La Blue Girl franchise. She is the final heiress and descendant of the ancient Miroku ninja clan, a female lineage originating in the Sengoku era. Her heritage stems from mixed parentage: her father is Seikima, the demonic King of the Shikima, while her mother, Maria, is a human and former Miroku ninja. This half-demon ancestry grants her distinctive blue blood, referenced in the series' title. Her older sister, Miyu Mido, resulted from Maria's prior union with a Suzuka clan member, making them non-blood-related siblings. Due to this family history, Maria faced exile from the Miroku clan, leading Miko to be raised and formally trained in ninjutsu by her grandmother.

Her training commenced young, progressing from foundational ninja skills to specialized "sexual ninjutsu" combat techniques. These abilities define her: projecting hardened pubic hair as needles (Iron Pubes), secreting blinding milk from her breasts (Milk Strike), enlarging her clitoris to penetrate female foes (Nyoninboh), releasing vaginal acid (Acid Blast), and manipulating acupuncture points with her hair to induce opponent orgasms. Her most potent ability, "Aoi Tatsumaki" (Blue Whirlwind), generates a tornado from her hair, frequently destroying her clothing; this technique arises from her demonic heritage, not Miroku training. Despite her proficiency, Miko expresses frustration at being weaponized through sexuality, yearning for a normal adolescence and conventional romance.

Physically depicted as a fair-skinned teenager standing 158 cm tall, she possesses orange-auburn eyes, purple hip-length hair typically secured by a signature pink ribbon, and measurements of B87-W56-H80. Her design evolved across media: in La Blue Girl Returns, she adopts a more athletic physique, trades her classic loose green shirt and black leggings for a fitted white jacket, yellow skirt, and white stockings, displaying greater muscular definition.

Her narrative spans multiple conflicts. The core storyline involves her quest to recover a stolen pact-sealing compact controlling the Shikima demons, forcing her to defend against demonic incursions and rival ninja clans using sexual ninjutsu. Key adversaries include her vengeful former instructor Kamiri and the Suzuka clan. Later, she confronts Fubuki Kai, a self-taught ninja rival who becomes an ally after adoption by the Shikima. The Lady Blue OVA arc explores her romantic involvement with Hidemasa, complicated when phantoms kidnap him to resurrect a cursed love story, forcing Miko to reconcile personal desire with duty. In La Blue Girl Returns, she battles the insectoid Mahoroba clan seeking the Shikima Brain—a locus of cosmic power—gaining allies like Kanako, a nursing student trained in carnal arts for the Miroku clan. Throughout these conflicts, Miko engages in sexual encounters with multiple female characters, including Fubuki, Yaku, Kochō, Kanako, and Ruri, while self-identifying as theoretically virginal.

Censorship adaptations for Western releases altered her age from 16 to 18 and removed scenes involving her dwarf companion Nin-Nin to comply with regional laws regarding underage characters and explicit content.