|Season||Season Heart Pretty Cure!|
|Hair Color||Brilliant pink|
|Family||Koizumi Hana (older sister), Chinen Akemi (adoptive older sister), Koizumi Aika (mother)|
|Voice Actor(s)||Sugaya Yayoi|
|Pretty Cure Info|
|Weapon||Baseball bat (pounded Stone once, much the Cures' humour)|
Keiko is a little girl, who has short and curly brilliant pink hair worn as a side plait. She wears a pink t-shirt and jeans, with a purple skirt over it. She wears pink boots as well.
Keiko is depicted as a spoilt and rather rude girl, and it is unknown why she hates Akemi. However, she looks up to her sister Hana, and looks a lot like her.
Koizumi Hana - Keiko's older sister. Keiko looks up to Hana and Hana takes care of her, however, Hana hates it when Keiko is rude to Akemi.
Chinen Akemi - Keiko's adoptive older sister. It is unknown why Keiko is rude to and hates Akemi.
Koizumi Aika - Keiko's mother.
- Keiko shares the same voice actress as Sagara Mao, a minor character appearing in Happiness Charge Pretty Cure!.