Junko Tange, president of Green Leaves Entertainment and producer for the idol group Wake Up, Girls!, presents as a fair-skinned young woman. Her neck-length blond-brown hair features bangs on the right side, complementing her hazel eyes. She typically wears earrings, long-sleeved shirts, jackets, and skirts.

Personality-wise, Junko is a chain-smoker known for her foul mouth and short temper. She frequently subjects her subordinate, Kouhei Matsuda, to physical and verbal harassment. Despite this abrasive demeanor and apparent disregard for others, she harbors genuine concern for Wake Up, Girls! and actively fights for their success in the competitive entertainment industry.

Her background includes managing the popular duo Twinkle before significant setbacks left Green Leaves Entertainment devoid of talent. Witnessing the I-1 Club's performance on television spurred her to launch a new idol group as a last resort. She tasked Matsuda with scouting raw talent, resulting in the formation of Wake Up, Girls!. However, just before their debut, Junko vanished with all the agency's funds, citing an accident involving her partner.

It was later revealed she used the misappropriated funds to aid her friend Katsuko, a former member of Saint 40. This act ultimately led Katsuko to compose the song "Beyond the Bottom" for Wake Up, Girls!. Junko intervenes protectively during the group's challenges, confronting a promoter exploiting the girls during a bikini performance and physically assaulting a reporter aggressively questioning Mayu Shimada about her past.

Leveraging industry connections and making tough decisions, Junko remains committed to managing Wake Up, Girls!, employing morally ambiguous methods aimed at ensuring the group's sustainability and growth.