Seiko Ayase is a fascinating blend of a laid-back, fierce, and deeply caring individual. Despite being a grandmother, her mindset completely defies her age. She possesses a highly pragmatic, phlegmatic, and casual attitude toward life, rarely showing panic even when facing world-threatening supernatural dangers. Seiko Ayase possesses a fascinating, multi-layered personality that effortlessly blends a laid-back attitude with fierce, protective instincts. Despite being a grandmother, her mindset completely defies traditional aging expectations. She treats life with a highly pragmatic, phlegmatic, and casual approach, rarely showing panic even when facing dangerous supernatural anomalies. At her core, Seiko is blunt, uncouth, and brutally honest. She speaks her mind without filtering her words, which often makes her appear coarse or intimidating to outsiders. However, this tough exterior hides a deeply empathetic and generous heart. She strongly adheres to a philosophy of communal support, believing that those under her roof are part of one large family. As a guardian, Seiko is fiercely independent and protective. She views it as her duty to shoulder the heavy, terrifying burdens of the supernatural world so that the teenagers around her—like her granddaughter Momo and Okarun—can enjoy their youth freely. She does not coddle them; instead, she uses tough love to build their resilience, teaching them to stand on their own two feet while remaining a reliable safety net when they stumble.

Momo Ayase is characterized by her fiery, assertive, and independent attitude. Raised by her grandmother Seiko, she has a no-nonsense personality, a sharp tongue, and a quick temper that she readily uses against bullies or supernatural threats. Despite her brash exterior, Momo’s defining trait is her immense capacity for empathy and kindness. She has an innate, fiercely protective instinct toward underdogs and friends, willingly risking her life to save them. While initially focused on high school popularity and trends, she displays incredible strategic intelligence, mental resilience, and a stubborn refusal to give up when facing extraordinary dangers.