Elizabeth Margaret, the alias of Izumiko Todayama, serves as personal maid to Itsuki Noya, heir to the Noya Group. Discovering Itsuki's involvement with the Ebisugawa High School Astronomical Club prompted her transfer to that school. Her primary goal was reclaiming Itsuki, whom she considers her possession, refusing to cede him to the club's president—her older sister, Kyoko Todayama.

While she demands Itsuki address her as Elizabeth Margaret and calls him her "toy," she harbors genuine affection beneath this possessiveness. After encountering Itsuki cross-dressed in the club (a requirement for his membership), she actively works to perfect his feminine appearance. Her presence escalates existing tensions within the club, sparking competitive clashes with Kyoko over Itsuki's allegiance.

She possesses black hair reaching chest-length and red eyes. Her typical attire is a school uniform complemented by a headdress, hair ribbon, bow, and stockings. Her demeanor mixes an oppressive, confrontational attitude—at odds with a traditional maid's role—with moments of vulnerability, particularly regarding her strained relationship with Kyoko. This friction leads to direct confrontations, including a quiz battle halted by the student council.

Formally joining the Astronomical Club secures her ongoing presence. She participates in group activities like stargazing, where she once identified a celestial body she termed the "Death Star," revealing awareness beyond her interpersonal conflicts.