Megumi Ayase reigned as Parthenon Productions' top idol before Creamy Mami's ascent. Her dominance shattered when Mami's meteoric rise sparked a declared rivalry. Secretly harboring romantic feelings for agency president Shingo Tachibana, Megumi reacted to his perceived neglect—particularly when he favored Mami—with fiery outbursts and physical slaps, intensifying her professional jealousy and insecurity.

Initially arrogant, spoiled, and selfish, she also displayed fierce determination and exacting standards. The threat to her status forced her to confront her principles, sometimes adopting underhanded tactics to succeed. Megumi feared heights and cultivated a signature look: long brown hair, blue eyes, and a dark pink stage dress trimmed in white frills.

The spin-off manga *Magical Angel Creamy Mami and the Spoiled Princess* centered on her perspective, detailing her fury as Parthenon shifted focus to Mami—an enigma Megumi saw as endangering her legacy. She obsessively pursued Mami's secrets, witnessing baffling events like magical occurrences during performances. Her sabotage attempts aimed to reclaim her top-star status and regain her superiors' approval.

This narrative highlighted her professional turmoil and inner conflict. Though initially abrasive and unlikable, it revealed her vulnerabilities: dread of irrelevance and a complicated bond with Tachibana. While never uncovering Mami's magical origins, she grew increasingly suspicious of supernatural forces around her rival. Her arc across all media consistently revolved around the rivalry with Mami, unrequited love for Tachibana, and struggle against career decline, preserving her core traits without resolving central tensions.