Hassu, also known as Hass, stands as one of Rikka Takarada’s closest companions, frequently appearing alongside Namiko. Though quieter than her lively friend, she engages in playful teasing of Rikka, especially regarding moments shared with Yuta Hibiki at the 7-21 shop. Her reserved demeanor contrasts with a sense of responsibility, such as urging Namiko to focus during class. A perpetual flu mask obscures her face, worn despite perfect health. She responds with visible aversion to inquiries about her unmasked appearance, exemplified when Yuta voices curiosity. The mask’s design nods to Soundwave from *Transformers: Shattered Glass*, while her Ravage-branded blanket reinforces this homage. Her name potentially echoes Hasbro, the franchise’s creator. She sports long black hair in a side ponytail fastened by a green scrunchie, paired with blue eyes. Her attire includes a white shirt tucked into a black skirt adorned with a dark pink bow, complemented by a Ravage-printed blue towel, white socks, and dark brown shoes. During a mountain excursion, she dons a blue bikini beneath an open coat, her hair occasionally in a bun—though the mask remains ever-present. Kaiju attacks in Tsutsujidai subject her to recurring memory wipes, erasing recollections of Gridman and vanished classmates. This cycle persists until Alexis Kerib’s defeat, after which her existence stabilizes. Beyond school, she operates a YouTube channel under the alias Hassun, mirroring Shattered Glass Soundwave’s role as a communications-focused Decepticon. Her narrative role remains fixed as a secondary figure, underscoring the story’s memory-altering stakes while contributing levity through her rapport with Rikka and Namiko. Official media confines her development to these core interactions, without expansion into spin-offs or extended lore.