Juju acts as a key aide to the primary antagonist Yomi throughout multiple Babel II adaptations. She actively scouts and recruits psychics for Yomi's organization, dedicated to world domination via psychic powers and securing the Babel Legacy. Her first meeting with protagonist Koichi involves testing his abilities and attempting to recruit him for Yomi's forces.

Recognizable by her distinctive lilac or pink hair and consistently fashionable style, Juju navigates conflicting impulses towards Koichi. Despite their opposing sides, she develops an unexpected attraction to him, repeatedly trying to sway him to Yomi's cause during confrontations. This fuels ongoing tension between her loyalty to Yomi and her personal interest in Koichi.

Within the narrative, Juju primarily functions as an antagonist directly opposing the protagonist while simultaneously introducing emotional conflict. Her recruitment missions and personal entanglement with Koichi drive significant plot elements across adaptations. Her background and motivations remain largely unexplored, with no detailed origin story provided.

Her character arc concludes without definitive resolution regarding her ultimate fate or ideological alignment following Yomi's repeated defeats. No further development or documented appearances occur beyond her established role opposing Koichi while displaying this conflicting personal interest.