Gaku Yaotome, a member of the idol group TRIGGER, possesses a passionate and straightforward personality marked by a strong dislike for losing and intense dedication to his work, occasionally revealing a sharp tongue. Despite his confident public image, he maintains a deeply honest and upright nature, sensitive to negative rumors surrounding his group. His background includes divorced parents, leading him to place significant value on familial connections; he keeps ties with maternal relatives, secretly receiving gifts from his grandfather and mother while assisting at his grandfather's soba shop during free time. Professionally recognized as the "No.1 male most want to be hugged by" – clarified as widespread appeal, not literal – he is also highly sought for commercials and dramas. He holds a driver's license and enjoys driving, selects movies based on directors and cast rather than genre, collects bath powders, and has a notable fondness for soba. When facing low moods, he sometimes sends riddles unexpectedly. In relationships, he demonstrates thoughtful gestures, like gifting matching shoes after a casual compliment. He develops a clear romantic interest in Tsumugi Takanashi, attempting to ask her out for meals and offering late-night drives home, though scheduling conflicts often intervene. He supports her professional growth by suggesting disguises to observe TRIGGER rehearsals and offering concert tickets, which she insists on purchasing as a fan. To maintain privacy around his family connections, he delivers soba to Tsumugi and IDOLiSH7 members incognito, leading them to mistake him for a lookalike.