Ran Ran holds the title of Judgment Princess within the secret organization Gekko. She operates under Drone Rabbit's command as part of a specialized espionage and special operations unit. Her background involves joining Gekko in an environment devoid of social interaction, where she endured rigorous training in sabotage and intelligence gathering. This isolation fostered a withdrawn personality, leading her to avoid others and habitually conceal her face due to uncertainty about her expressions. The meaning of her name, "disturbance" in Japanese, reflects her enigmatic nature.

Initially maintaining complete emotional distance, Ran Ran executed missions alone, including the undetected sabotage of Gelato 5's weapons. Her development began when Desumi Magahara, recognizing her solitude, orchestrated a sleepover disguised as a strategy meeting. Attending disguised as Fudo Aikawa before revealing herself, Ran Ran intended an immediate departure. Yet she stayed, participating in activities like sharing takoyaki and discussing romance. She ultimately accepted a hand-knitted scarf from Desumi, a symbol of friendship. Later that night, Ran Ran privately confided in Desumi, expressing enjoyment and gratitude – marking her first meaningful social connection.

Ran Ran participated in critical Gekko operations, including the creation of the Ultimate Phantom. When this entity betrayed Gekko and assaulted their base, she joined other executives in a futile counterassault. She then witnessed the Gelato 5's victory against the Phantom alongside Drone Rabbit. Her abilities encompass mastery of disguise, allowing perfect mimicry of appearances and voices, and the combat technique "Duàn Zuì Liè Lún". This technique manifests as a spinning blue-fire disk launched from the wheel on her back.

Her foundational relationship remains with Desumi, whose initiative directly facilitated Ran Ran's gradual integration with fellow princesses. She appears exclusively in the main storyline.