Jun Sazanami is a diligent and passionate individual who relentlessly pushes his personal limits through rigorous fitness and expressive training. As a member of the idol unit Eden under COSMIC PRODUCTION, he also performs in the unit Eve alongside Hiyori Tomoe. Publicly, Jun maintains a polite, level-headed demeanor that earns him respect, but privately reveals a sarcastic and foul-mouthed side, especially when reacting to Hiyori's eccentricities. Despite their friction, Hiyori considers Jun a precious partner striving earnestly to stand as his equal. Physically, Jun possesses a slightly tanned complexion, an athletic build, and average height. His spiky dark-blue hair is cut short below the ears with crossed bangs, complemented by light-golden eyes. His background connects him to the idol industry through his father's past, specifically linking him to childhood idol Jin Sagami—Jun kept a poster of Jin by his bed for comfort. He attended Reimei Academy, adhering to a disciplined routine focused on self-improvement. Strict childhood restrictions led him to frequent manga cafés for shounen manga; he rarely played video games initially but later developed an interest, including mobile games. During school, he held various part-time jobs as a convenience store cashier, construction worker, and mover. He cooked for himself and Hiyori when they shared a Reimei dorm, during which time they rescued an abandoned dog named Bloody Mary, kept by Hiyori against school rules. Jun demonstrates increased sociability and adaptability over time. Initially unaccustomed to casual interactions with idols outside Reimei's competitive environment, he gradually embraced relaxed group activities like the ASOBI Club's game sessions. Observers noted his "color" brightening, reflecting personal growth. He obtained a motorcycle license primarily to retrieve Hiyori during wanderings, though Hiyori criticized it as "vulgar." In collaborative projects like the "Bankara Academy" webcast, Jun showcased versatility—even cross-dressing as a female teacher named "Jinko Sagami." He expressed frustration when projects underwent abrupt directional shifts, feeling manipulated by surprise filming tactics, but later adapted, acknowledging the idol industry's evolving demands alongside peers like Kohaku and Tatsumi. His name carries meaning: "Jun" (純) signifies "genuine" or "pure," reflecting his blunt honesty, while "Sazanami" (漣) means "ripple," alluding to his growing impact. He views chance encounters as significant, seeking meaningful connections with fellow idols beyond work constraints.