Eiko, a second-year student in Babyls Demon School’s Class A, sports long, slightly frizzy blonde hair with uneven bangs, black bull-like horns, pointed ears, and large yellow eyes. Her uniform adheres to the standard female design: a pink capulet, skirt, and red bow fastened with a cat-eye clasp. Initially a background figure, she gains narrative prominence after Suzuki Iruma rescues her during his duel with Asmodeus Alice, igniting a fervent admiration that drives repeated—often humorously awkward—attempts to connect with him. Later, Azazel Ameri’s intervention during a school assault sparks a romantic interest in her as well, culminating in Eiko acknowledging feelings for both. Sociable yet introverted around those she idolizes, Eiko balances casual classmate interactions with reserved hesitation in the presence of Iruma or Ameri. Her resilience shines during the Harvest Festival, where she survives through stealth and sharp observation. A penchant for daydreaming about her crushes often leaves her oblivious to their proximity during conversations. She shares a close friendship with Gaako, who patiently endures her exuberance, and forms an unexpected alliance with Asmodeus Alice after initial conflict over photographing Iruma. The duo bonds through their mutual admiration, exchanging contacts and collaborating on compiling images of him. Eiko further supports Iruma academically by crafting study aids for his exams. In the *If Mafia AU* spin-off, Eiko assumes the role of an undercover journalist, leveraging her dedication to documenting Iruma’s exploits—such as capturing his escape from an explosion—to advance her career. This alternate version mirrors her main counterpart’s relentless pursuit of Iruma-related intel, albeit with occasional mishaps. Her family comprises a younger brother, Eita, though their dynamic remains unexplored. Primary media offers limited backstory elaboration, with no confirmed expansions in films, OVAs, or additional spin-offs beyond the noted alternate universe.