Status: Alive
Gender: Female
Birthday: June 6 (Gemini)
Height: 160 cm (5'3")[1]
Weight: 52 kg[1]
Blood Type: O Rh(+)[1]

Kokoro (Code:556) has such a nice and gentle personality that the boys in the team consider her as a Madonna-like existence. Even though she speaks very little, when she does, she is very considerate and thoughtful of others.

She is partnered with Futoshi (Code:214) and pilots the FranXX Genista.

She is later partnered with Mitsuru (Code:326).