Ikuma Amaki performs as a member of the idol group Shōnen Hollywood. Before becoming an idol, he lived as an ex-Yankee, a Japanese delinquent, and left high school without graduating. His departure from school stemmed directly from a physical altercation with other members of his former Yankee group. This lack of formal education results in his ongoing struggle to read kanji characters. Within Shōnen Hollywood, Ikuma holds the prominent center position during performances. His designated Hollywood color is green.