Lizlet L. Chelsie is a tsukumogami, a spirit that originates from an inanimate object given life after a hundred years. Her true form is an antique teacup that came to Japan from England, and she manifests as a young woman with long blonde hair and blue eyes, typically dressed in a maid uniform. She is a main character in the story, first appearing as the head waitress of a maid cafe called Cafe Relish, where she gains popularity for her excellent tea service and cheerful demeanor. Her role later shifts when she begins serving Yuto Amakawa and the other residents of the Noihara household, dedicating herself to domestic duties such as cleaning, cooking, and brewing tea.

Lizlet is defined by a gentle, polite, and hospitable personality. She speaks with a slightly formal tone and often giggles when embarrassed. She is notably clumsy, frequently causing minor mishaps like spilling tea or dropping items, which she follows with earnest apologies. Despite this, she is a dedicated peacemaker who uses her calm words and tea to mediate arguments among the housemates. Her primary motivation is to create a harmonious and comfortable environment for those she cares for, viewing Yuto and the others as a new family. She finds joy in serving others and takes pride in her maid role.

In the overarching narrative, Lizlet serves as a source of comedic relief and domestic support, providing a non-combative presence among a group of supernatural fighters. While she does not engage in direct combat, she possesses minor abilities related to her origin: she can manipulate tea leaves and water for practical purposes, such as preparing the perfect cup of tea for any customer or household member. These abilities are used only for domestic ends, never for violence.

Her key relationships include a deep loyalty to Yuto Amakawa, whom she serves faithfully and seeks to please. She shares a close friendship with Shizuku, another spirit in the household, bonding over their shared circumstances and often mediating any tension between them. She interacts warmly with other companions, treating everyone with equal hospitality. Her development across the series is subtle, mainly shown through her growing sense of belonging and her transition from a cafe employee to a devoted member of the Noihara household. Her cheerful, clumsy nature and dedication to peace make her an endearing and stabilizing presence in the group.