Jun-Jun operates as part of the Amazoness Quartet within the Dead Moon Circus, serving Zirconia and Queen Nehelenia. She possesses a tomboyish personality, an athletic build, tan skin, dark green eyes, and long light green hair arranged in three ponytails—one pointing upward and two angled downward. Her standard outfit features a green two-piece loincloth bikini, pale mint green Arabian-style pants, green sandals, and a dark purple centerpiece on her belt. As the circus's acrobat specializing in tightrope walking, her pragmatic impulses often manifest through informal masculine speech. Her primary duty involves hunting victims' Dream Mirrors using nightmares deployed from her green Amazon Stone. She uniquely summons male Lemures, frequently with fish-themed appearances like Pakupaku and Biribiri. Her attacks include propelling explosive orbs with a baseball bat, employing "Colliding Ball" to extract Dream Mirrors, "Rolling Ball" for offense, and "Through Ball" to traverse solid objects. In some continuities, she uses the "Tama Gusuri" (Gem Medicine) attack, its effects unspecified. Originally dwelling in a jungle, the Quartet accidentally awakened Queen Nehelenia. In gratitude, she granted them eternal youth and Amazon Stones. During the Dead Moon conflict, Jun-Jun and her sisters began questioning their allegiance. After helping Nehelenia capture Sailor Chibi Moon to lure Pegasus and seize the Golden Crystal, Zirconia imprisoned them in mirrors. They ultimately rebelled by shattering their Amazon Stones, sacrificing eternal youth to break Nehelenia's control and aid Sailor Moon. Her true identity is revealed as Sailor Juno, one of four Sailor Guardians of the asteroids (Ceres, Pallas, Juno, Vesta) destined to protect Sailor Chibi Moon in the future. Brainwashed by Nehelenia into servitude, she and her sisters were awakened prematurely. Following Nehelenia's defeat, they reverted to their guardian forms and returned to slumber in the Amazon Jungle, awaiting Sailor Chibi Moon's full maturation. Her name derives from the asteroid Juno, linked to the Roman goddess of marriage and birth, though her methods contrast this association by allowing targets to fulfill dreams before attacking. Her narrative encompasses manipulation, redemption, and the fulfillment of her ordained protective role.