Hass ranks among Rikka Takarada's closest friends, usually appearing alongside Namiko. She exhibits a quieter and more reserved personality than Namiko, yet readily joins in teasing Rikka about her interactions with Yuta Hibiki. Hass displays a greater sense of responsibility, such as urging Namiko to sit down during classroom disruptions. Her appearance is defined by long black hair worn in a side ponytail secured with a green scrunchie, blue eyes, and a constant white flu mask covering her lower face despite perfect health. She reacts with visible disgust to any questions about her appearance without the mask. Her standard school uniform consists of a white shirt tucked into a black skirt featuring a dark pink bow, paired with a blue towel displaying the word "ravage" alongside a cat image, long white socks, and dark brown shoes. During a mountain field trip, she wears a blue bikini under a loose coat and occasionally wears her hair in a bun, always retaining her mask. Outside school, Hass operates a YouTube channel under the alias "Hassun" (はっすん). Her character design origins pay homage to Shattered Glass Soundwave’s communications role from Transformers. Hass is 15 years old, born on March 24, 2003, stands 155 cm tall, and has blood type A. Within her relationships, Hass and Namiko frequently tease Rikka about Yuta after witnessing them together at a convenience store. Following each kaiju attack, Hass and her classmates lose memories of the events, including forgetting missing peers, a cycle that repeats until Alexis Kerib's defeat restores normalcy in Tsutsujidai. Later, during the events of *Gridman Universe*, Hass enters a secret romantic relationship with Sho Utsumi. They deliberately keep this relationship hidden from their friends, including Rikka and Yuta. Her character song "Oh! My hero!" is a duet with Namiko included in the *SSSS.GRIDMAN BEST ALBUM* compilation. Her mask corresponds to Soundwave’s mouthplate and her towel references the Decepticon Ravage. Her name may derive from "Hasbro," co-creator of the Transformers franchise.