Rokka Asahi, known professionally as LOCK, attends Haneoka Girls' High School as a second-year student council secretary. Hailing from Gifu Prefecture, she secured a scholarship to Haneoka, placing her in the same class as Asuka Toyama and Ako Udagawa. She balances her studies with part-time work at Live House Galaxy as an interim event representative and at her family's Asahi Bathhouse, where she also resides. Childhood struggles marked her academic and practical efforts, with guitar playing emerging as her singular success. This passion drove her to form the middle school band TRICK, BERRY, and PAT. Relocation to Tokyo forced the band's disbandment after a final "fresh start" performance. Her move was inspired by witnessing Poppin'Party perform "Mae e Susume!" at SPACE's final live, instantly making her their devoted fan. Initially facing her father's opposition, she secured housing through cousin Nanami and won his approval by pledging diligent study and mastering household chores, ultimately demonstrating her commitment. Slender with leafy green eyes and slate blue hair, Rokka typically wears it in a low ponytail held by a star-patterned scrunchie. She sports thick black glasses casually but removes them, along with the scrunchie, for performances. Her initial casual outfit features a floral print frilly dress, loose green socks, brown Mary Jane shoes, and a necklace holding her house key. Her performance hairstyle evolved from twin ponytails to a side plait. Personality-wise, Rokka is kind, shy, yet tenacious. She often vocalizes distress as "hiiii" ("eek"). Nervousness or excitement can trigger her native Gifu dialect, though she frequently uses "dera" ("really") regardless. She exhibits passionate focus on guitar topics, capable of lengthy discussions, and competes fervently with Mashiro over Poppin'Party fandom. Discipline extends to her finances, managed via a dedicated spending notebook. As LOCK, guitarist for RAISE A SUILEN, she wields a distinctive 7-string guitar variant. Her stage name plays on the near-homophone for "Rokka" in katakana and references her key necklace. Narratively, she serves as a deuteragonist in BanG Dream!'s second anime season, chronicling her band formation. She appears across anime seasons, the film Poppin'Dream!, the manga RAiSe!: The Story of My Music, and the game Girls Band Party!, debuting in the "Determined Darkness, Blue Rose Pride" event as RAISE A SUILEN's first member. She also participates in the chibi-style BanG Dream! GARUPA☆PICO ~Ohmori~ ensemble episodes. Her hobbies include humming Poppin'Party and RAISE A SUILEN songs, traditional enka melodies during bathhouse work, and listening to rakugo. Trivia notes her shared height of 155 cm with several characters, her July 17 birthday coinciding with THE THIRD's 2nd Live event date, and a Tokyo Revengers collaboration design inspired by Hanagaki Takemichi.