|Season 2 | Winter Uniform|
|Romanized Name||Saegusa Kī|
|English Name||Kī Saegusa|
|Data Carddass Game||New 1st|
|Anime||That Rocking Girl is the Dream☆Girl|
|Singing Voice||Yuna from STAR☆ANIS|
– Kī's main catchphrase.
Kī has bright blonde hair with puffy, balloon-like twin-tails, each tied with a green ribbon and cerulean eyes.
As a pop-type idol, Kī is very cheerful and energetic. She has a habit of saying certain words twice or even thrice before ending a phrase or sentence. This is revealed to be an influence from her mother who would do the same. Kī states that her mother is "her producer", having been her main boat of support and confidence in her childhood.
Kī first appeared during Seira's debut, telling Seira not to tell Aoi Kiriya her entire background which she ended up telling in the process. During her childhood, Kī was a very shy girl with no friends. She stated that she was jealous of all the other girls in class, because they were cute, and she wasn't. Kī's mother noticed her dilemma and subsequently casted a "spell" on her daughter to give her self-confidence so that she may be cute. Because of this, Kī has been able to grow more confident in herself, and eventually entered Dream Academy where she was introduced to Seira; becoming her producer and later on, an idol.
- Kī might be half-foreign, given her appearance and birthplace.
- Kī's favorite beverage is Brain Thunder and her favorite food is Pon Pon Crepes, and her least favorite is spicy curry.
- Her zodiac sign is Sagittarius.
- Kī is known as "A Great Producer" and has been entrusted with the task to help Seira for her debut.
- She is the fourth idol who didn't wear her basic coord for her debut.
- Her aura is composed of a single toy alicorn that wears a pearl necklace, bubbles filled with whimsical objects, and smaller bubbles.
- The alicorn in Kī's aura bares a striking resemblance to Opal from Jewel Pet.
- She shares her singing voice and brand with Kaede Ichinose.
- This makes her the second idol to share her singer with another character.
- She is the third idol to wear glasses.
- She and her mother used to name the accessories they made, but now they refer to them by number.
- Kī's weakness is said to be small talk.
- She gets her first Premium Coord - the Unicorn Sagitto Coord - in Episode 66.
- She is the first idol to perform the Pop Flash special appeal.
- As of Episode 91, Kii is the only main character not to have been in an official unit.
- Main article: Kī Saegusa/Image Gallery