Garnet hails from Dordtgard as a member of the unit IV KLORE, presenting as a 15-year-old girl with lustrous black hair and standing 155 cm tall. She typically wears her school uniform with black tights and Mary Jane shoes. Her lower legs exhibit partial translucency, revealing her ghostly nature, though amnesia prevents her from recognizing this truth; she dismisses allusions to it as humor and perceives herself as living ordinarily. This creates irony given her aversion to supernatural themes like ghosts and horror stories.

Cheerful and eager for friendships, Garnet expresses affection through intense yet flawed behaviors, maintaining 44 volumes of diaries detailing romantic fixations. Her stalking tendencies target unitmate Emilia, whom she admires but fears due to Emilia’s succubus traits. This dynamic fuels comedic tension, distressing Emilia during their interactions.

Her ghostly abilities include telekinesis, phasing through walls, and projecting her presence or voice through objects. IV KLORE leverages these skills in performances with dark, gothic aesthetics and horror motifs. Garnet is cast in ghostly Drama Club roles, earning praise for her unsettlingly convincing "acting."

Within IV KLORE’s "dark magical girls" theme—reimagining folklore entities through gothic lolita elegance—she shares childhood bonds with Emilia, Alpha (α), and Salsa. Alpha engages her in blunt discussions about her ghostly state, while performances highlight her abilities to underscore the unit’s demihuman narrative.

Her long, straight hair features uneven bangs, evoking traditional Japanese yūrei depictions where disheveled hair symbolizes funeral rites. Her violet-collared uniform suggests Flora Girls' Academy once had a fourth rank below Noir, implying she predates the current era.