Rū Asuka is an idol in the unit Oshama Tricks, partnered closely with Devi Fudo. She possesses sharp, large blue-gray eyes and long dirty blond hair featuring thickly curled forelocks and neatly parted bangs. A distinctive single fanged tooth is often visible at the corner of her mouth.

Her classmate, Hikari Momoyama, frequently lectures her, suggesting Rū engages in behavior prompting such guidance. The unit Oshama Tricks embodies a "devil" motif. Their names reflect this: "Luu" (ルゥ) originates from the "L" in "devil," while "Devi" represents the "D," forming the complete word together. Rū's surname "Asuka" further reinforces this theme, referencing Ryo Asuka, the antagonist from the *Devilman* series. The name "Asuka" (明日香) itself combines "asu" (明日), meaning "tomorrow," and "ka" (香), meaning "fragrance" or "scent." True to their devilish identity, Oshama Tricks is known for mischievous activities like playing strange pranks.