Ai-chan, renamed Dina in the English adaptation, begins her story as a fairy infant emerging from an egg discovered by a boy named Joe in a river. Introduced as a cryptic, speech-limited child who communicates with melodic suffixes like “~kyupi,” her origins unfold as a former companion to Cure Ace, a magical warrior. Their partnership ended when a clash with the Selfish King forced Ai-chan into an egg-like state, scattering her and Cure Ace across dimensions—Cure Ace to Earth, Ai-chan to dormancy until her rediscovery by new allies.

Her lineage connects her to the Trump Kingdom’s monarchy, where she once reigned as Princess Marie Ange. To evade the Selfish King’s corrupting grasp, she fractured her soul: her benevolent half became Ai-chan, while her darker impulses materialized as Regina, the story’s primary adversary. This schism spared her from the kingdom’s ruin but weakened her magic until she reunited with Cure Ace.

Ai-chan’s powers fluctuate with her emotions, enabling her to conjure Cure Loveads—enchanted tools that amplify her allies’ abilities—and erect defensive shields. However, her distress risks empowering the antagonists, intertwining her stability with the conflict’s outcome. The protagonists sustain her through Lovead artifacts, including enchanted milk bottles that nurture her growth.

Over time, her broken speech evolves into fluency, reflecting her deepening bonds with the human world. She forges a familial tie with protagonist Mana, magically persuading her to become her adoptive sister. A crucial reunion with Cure Ace reignites the warrior’s combat prowess, though temporary limitations initially hinder their teamwork.

The final arc unveils Ai-chan’s past as Princess Marie Ange, clarifying her purpose as a bulwark against the Selfish King. Post-victory, she retains her youthful form but embodies the bridge between Earth and the renewed Trump Kingdom. Visually, her angelic wings, heart-shaped hair ornaments, and golden attire underscore her symbolism of innocence and compassion.