Chiffon

Infinity (インフィニティ) is the limitless memory and a god-like entity. During a crisis; she was forced to take the form of, or repressed herself into Chiffon, a baby fairy.

Story
The elder of the Kingdom of Sweets leaves Chiffon in the forest as he goes to a temple. She witnesses the four Pickruns play with her, then fly off. She is later found by Tart, and he takes her with him as he goes to the real world. Tart becomes her caretaker for his stay in the human world.

There, she senses each of the first three Pretty Cure awaken. She and Tart stay with Momozomo Love in her residence.

Love loses the link to Cure Vitan, the one who provides Chiffon with food. Love can't get food from the Linkrun, so she makes something for her. Chiffon is finicky at first, but she eventually tries it. After Wester attacks with a flower Nakewameke, Chiffon activates her powers, giving Cure Peach the Peach Rod.

Tart's video game playing last night resulted in Chiffon falling sick. Yamabuki Inori takes up the task of healing her. The next morning, Chiffon is not cured. After Souler's game system Nakewameke attacks, Chiffon learns to speak and calls upon the Kirun to help Cure Pine.

Wanting to be equal to Love and Inori, Aono Miki takes up the task of babysitting Chiffon. Miki knows nothing about making a baby happy, and she tries to appeal to her, but her attempts fail. When the baby wanders off during a photo shoot, Miki frantically searches for her. She finds Chiffon with Love and Inori and her embrace makes Chiffon open up to her, releasing the Burun.

The Life Gauge Labyrinth holds was apparently a seal to holding Infinity, the higher it goes, the less it has hold on it. After a dual attack from Souler and Wester, the gauge goes to it fullest, breaking the seal and revealing the entity Infinity from within Chiffon.