Midori Kohakobe is a vampire who outwardly appears human, typically resembling a high school student. She has short dark brown hair, large coffee-brown eyes displaying lighter coloration near the pupils, and white pupils. A single visible fang is often present, even when attempting to blend in, aligning with moe aesthetics. Her attire frequently consists of oversized tops with skirts. While working at the maid café "Vamp," she wears a French maid uniform and Mary Jane shoes, using the professional name "Midori." She holds the top popularity position at "Vamp" among staff and patrons, attributed by her colleague Arisa to her natural cuteness rather than performative behavior. Midori's personality centers on an intense need for social approval and narcissistic tendencies; rejection severely wounds her pride, triggering resentment or obsession. After Kou Yamori states she is not his type, she fixates on compelling his affection through her charm, later declaring she would never forgive his rejection. She openly acknowledges her dependency on external validation as a "sickness," rationalizing it as a universal human trait and asserting all people are fundamentally flawed and must develop coping mechanisms. Midori selectively targets men struggling with romantic inexperience, particularly those distressed over their virginity or otaku identities. Her preferred method employs conversational tactics designed to foster emotional dependency. She feigns intense interest in a target's personal life, culminating in asking if she is their ideal type and claiming devastation if rejected. This approach reportedly caused chaos in multiple human communities. She has only turned one human into a vampire subordinate. As a vampire, she possesses standard abilities: immortality, levitation, intangibility, superhuman physical attributes, rapid regeneration, and supernatural allure. Her relationships include alliances with fellow vampires Nico Hirata, Seri Kikiyou, Hatsuka Suzushiro, and Kabura Honda. Initially antagonistic towards Kou Yamori after his rejection, she later transitions to a more neutral or friendly dynamic. She interacts professionally with Arisa at the café and knows Nazuna Nanakusa as a former coworker. Her background lacks extensive elaboration; she expresses disinterest in her human past, viewing forgotten matters as irrelevant and the present as paramount. In one narrative arc, she participates in an investigation at "Vamp" alongside Kou and others to address inappropriate photography targeting her coworker Arisa.