Junko Konno, born September 2, 1964, rose to prominence as a solo idol during Japan's Showa era, achieving fame in the late 1970s and early 1980s. Her popularity fueled the idol boom of that period, anchored by her signature song "50 and 4 Things Left Behind," which retained enduring cultural impact. Her career ended abruptly at age 19 on December 6, 1983, in a plane crash during her first Kyushu tour, an event echoing real-world aviation tragedies. Her hobbies encompassed fishing, yoga, piano, and consuming soy-based foods and washoku, while she disliked tomatoes and liver. Physically, she measured 155 cm tall, weighed 40 kg, and had blood type A.

Decades later resurrected as a zombie, Junko manifested grayish-blue skin marked by Frankenstein-like stitches mirroring her fatal injuries. She retained motion sickness and a fear of heights, persistent echoes of her plane crash death. Initially resistant to joining the idol group Franchouchou due to her solitary background and unease with modern idol practices, she attempted to flee with Ai Mizuno, only societal rejection forcing her return. Her strict adherence to Showa-era idol standards—prioritizing stage perfection over fan interaction—clashed with contemporary expectations, causing friction, especially with Ai. This ideological conflict led Junko to temporarily leave the group, isolating herself for weeks and even growing mushrooms on her head.

Her development focused on adapting to group dynamics and modernity. A turning point came when producer Kotaro Tatsumi urged her to embrace her identity without conforming, prompting her stage return. She later demonstrated loyalty during a thunderstorm crisis for Ai at the Saga Rock festival, offering vocal support that symbolized their reconciliation. In the "Revenge" storyline, anxiety over Ai potentially leaving Franchouchou for Iron Frill culminated in a solo concert where Junko literally smashed a guitar while reclaiming Ai, interpreting Kotaro's advice to "break it all." This act signaled a shift from reserve to decisive action. During a flood destroying Franchouchou's mansion, she prioritized rescuing tools for Ozaki doll-making over costumes, reflecting practicality.

Junko possessed exceptional singing abilities and mastered piano, acoustic guitar, and electric guitar. Her technical skills extended beyond music to carpentry, evidenced by reinforcing doors Tae Yamada could not break, and lock-picking. Despite claiming poor dancing aptitude, she performed effectively in group choreography, notably at Saga Rock after a hiatus. As a zombie, she exhibited non-aging physiology, limb detachment, and resilience to fatal injuries like lightning strikes.

Interpersonally, Junko maintained polite, formal speech, using "-san" honorifics. She grew closer to Sakura Minamoto, confiding in her during challenges, and respected Yugiri's elegance. Though terrified of Tae's persistent biting, she accepted Lily Hoshikawa's identity without judgment. Her relationship with Ai evolved from conflict to mutual respect, particularly after shared performances. To accommodate her shyness, Franchouchou marketed autographed "bromide" photos instead of direct fan meets, which became top-selling items.

Manga expansions showed her participating in group activities like crafting competitions in Yoshinogari Park and collaborative cooking. Chronologically 54 years old at resurrection, she remarked she might have been a grandmother if alive, underscoring her temporal displacement. Her legacy endured through continued cultural references to her music and merchandise popularity within the series.