TV-Series
Description
Gaku Ōguro is a member of the idol unit ROCK DOWN under TSUKINO TALENT PRODUCTION, standing at 180 cm with short black hair featuring bangs over his left eye and a distinctive ahoge, complemented by light green eyes. His height remained consistent from ages 22 to 25 between 2018 and 2021.

Ōguro exhibits exceptional patience and a calm, steady demeanor, rarely showing agitation. He embodies a nurturing, parental role in ROCK DOWN, earning the "mother" moniker through caretaking actions like cooking and guiding others. This easygoing surface hides a playful, teasing streak that draws him into amusing schemes. Underlying his stability is insecurity about being overshadowed by VAZZROCK members' talent, fueling his drive to surpass them.

Before joining VAZZROCK, Ōguro had no entertainment industry experience. His acting career began when childhood friend Ruka Nadumi persuaded him to join a play, leading to further roles due to his natural skill and cool presence, ultimately securing his VAZZROCK contract. His youth included a delinquent phase, resulting in a small stomach scar from a knife graze during a fight. He holds a business degree from college.

Across official media, Ōguro's narrative centers on reconciling his insecurities with his supportive identity. His rivalry with Ruka Nadumi is pivotal; he admires Ruka's genius while their competition pushes both to improve. Ōguro uniquely manages Ruka's unpredictability, affectionately calling him "Ruu." His relationships include steadfast camaraderie within ROCK DOWN, notably supporting Ayumu Tachibana through self-doubt and health struggles.

Additional traits include enthusiasm for camping, demonstrated when he joined Ruka and QUELL's Eichi for an outing. His culinary passion features prominently in drama tracks like the *bi-Color Series Season 3* volume "Hematite × Ruby," which revolves around food themes.

Trivia notes his nicknames: ROCK DOWN members use "Gaku," while staff call him "Gakkun." His surname Ōguro (大黒) combines "big" (大) and "black" (黒), and his given name Gaku (岳) means "mountain" or "peak."