Naminé is the Nobody of Kairi, and wields the power to manipulate the memories of Sora and those close to him. The first part of her name, nami means "wave" in Japanese, similar to Kairi's name, which is derived from the word for "sea".
Naminé first appeared in KHCoM, being forced and threatened with imprisonment by Marluxia to manipulate Sora via his memories. Fortunately, their ploy is foiled and Naminé is saved by Sora and she goes through the process of fixing his memories, alongside DiZ and Riku, for about a year[1]. She eventually returns to her true self, Kairi, at the end of KH2 but is able to leave a data message to Sora about those who were connected to his heart that are in need of saving.[2] She is later revived as herself with her own body at the end of KH3 and is helping search for Sora with the rest of the Twilight gang in Twilight Town.