Letuchaia brandishes the self-styled title of "princess" within G Society, reflecting her pride in her Nouvlesse ancestry. Her lineage defines her, fueling a deep resentment towards the Galactic Trade Organization (GTO) for forcibly evicting her Nouvelesse grandparents and leaving them homeless.

She exhibits a consistently proud yet childish personality, marked by snobbish behavior. She amplifies emotions through multiplication phrases, declaring herself things like "8 times more annoyed." Her respect is reserved solely for Geacht'er, whom she treats as a personal belonging, demonstrating possessive tendencies over valued people and objects. This possessiveness ignites extreme jealousy when Q-feuille assumes the role of Geacht'er's "little sister," driving her to actively eliminate this perceived rival.

Her primary combat ability, "Crazy Cracker," involves ejecting energy bolas from her fingers. Physically, she possesses distinctive heterochromic irises split horizontally, contributing to a striking appearance. Her name originates from the Russian "Летучая мышь" (Letuchai͡a myshʹ), meaning "bat," a theme reinforced by her bat-shaped brooch and connecting her to her cousin, Pauki (meaning "spider").

A pivotal shift occurs when she discovers Geacht'er's true goal: destroying the universe by removing Time Space, not creating peace. This revelation, combined with learning Geacht'er threatened G Society members' lives—including her grandmother's—to ensure Ascoeur's compliance, severs her loyalty to him completely.

Her familial ties include being Pauki's cousin and sharing a close, sisterly bond with her maid, Core. Core spies on other G Society Shadow Workers using a camera hidden in her glasses, occasionally revealing fujoshi tendencies, particularly concerning male agents Torch and Shade.