Ki is a character from the anime Kira Kira Happy Hirake! Cocotama. She is one third of a set of triplets, alongside her siblings Tsu and Mi. Together, the three are baby penguin-like Cocotama who were born from a set of toy building blocks, which grants them the divine title of Toy Block Gods. Ki made her first appearance in the eighteenth episode of the series.

In terms of personality, Ki is distinguished from her brothers by her temperament. While Tsu is characterized by a cheerful and laughing disposition and Mi is prone to crying, Ki is the one who can get angry sometimes. This trait defines her role within the trio, giving her a slightly more volatile or easily frustrated demeanor compared to her siblings. Despite these individual differences, the three are almost always seen together as a group, functioning as a unit.

The primary motivation and role for Ki, shared entirely with Tsu and Mi, is one of imitation and learning. As infant Cocotama, the triplets spend much of their time following and mimicking the actions of Doku-Doctor, a more experienced Cocotama who was born from a stethoscope. They view Doku-Doctor as a parental figure and are very fond of him. In contrast, they are not fond of Nachu, another Cocotama who serves as a nurse and later a doctor, indicating a specific preference for Doku-Doctor's guidance.

Because Ki is part of a triplet set that debuted together and shares a collective narrative, her individual development is tied to the group's experiences. No significant standalone character arc is detailed, with the trio's story focusing on their growth as babies under the care and example of Doku-Doctor. Regarding abilities, as baby Cocotama, Ki does not display any unique or notable powers distinct from the standard traits of her kind. Her primary activities involve being a young divine being learning about the world through observation and mimicry.