Arresta Blanket holds the position of fellow Jūden-chan and rival to Plug Cryostat, initially serving as her supervisor. Tasked with monitoring and recharging depressed individuals in the human world, she enforces a disciplined, no-nonsense methodology that starkly opposes Plug’s eccentric tactics. Their conflicting philosophies fuel heated rivalry, frequently escalating into physical brawls or sharp verbal exchanges.

Her physicality includes a notably prominent bust, which becomes a recurring target of Plug’s mockery. She adorns the skintight, semi-transparent attire standard among Jūden-chan, though her design leans toward a refined, mature aesthetic. A distinctive shift in her behavior emerges after encounters with Sento Oumi, a human who interacts with Jūden-chan: she develops a masochistic fascination with being struck by his baseball bat.

Unreciprocated romantic feelings for Sento complicate her duties, as he remains unaware of her affections despite her persistent advances. This unacknowledged tension bleeds into her professional conduct, merging frustration with obligation. She coordinates with colleagues like Kuran Shunt and Reika Galvini, Rōden-chan dedicated to capturing electrical criminals, though their interactions prioritize efficiency over camaraderie.

Documented media confines her role to the primary series, maintaining her as a steadfast foil to Plug. Her character balances comedic antagonism with glimpses of fragility—such as emotionally charged reactions leveraged for blackmail—while highlighting the friction between her austere professionalism and repressed personal cravings. The narrative focuses on these contrasts rather than delving into her origins or long-term evolution.