At the start of the first Kingdom Hearts game, in the scene where she passes through Sora. That was the instant her heart took refuge inside Sora's.
Namine, Kairi's Nobody, was created when Kairi lost her heart, while Roxas, Sora's Nobody, was created when Sora lost his heart. Because Kairi's heart was in Sora, Namine could control Sora's memories. Namine can take anyone's memories.
Here is the REAL answer: As you all know, Kairi is not supposed to have a nobody since she never turned into a heartless(because her heart is pure light). But, when Sora sacrificed himself he had 3 hearts inside of him:Ventus's heart, Kairi's heart and his own heart. Since he turned into a heartless (and the 2 other hearts we're inside him) 2 nobodies we're created: Roxas(Sora's nobody) and Naminé(Kairi's nobody). As for Ventus's nobody, he wasn't created because Ventus's heart went inside Roxas. That's why Naminé shares a special connection with Sora while she's Kairi's nobody, it is because she was born from both Kairi and Sora.
At the end of Kingdom Hearts 2, Namine is Kairi's nobody, so she meets her and Connects with Kairi. She still is alive, inside Kairi's heart, just like Roxas and Sora.
No, she goes back to the island after being separated by Riku then Sora. True, but she had lost her heart through the whole game. Sora almost dies, however, because he gave his heart (which contained Kairi's within) so she could live and be safe--his whole purpose on the adventure. He does get it back when Kairi shields him from the Heartless attack (even though he was a Heartless as well, but Kairi suspected it was him from the start). So, Kairi does not die...she goes back home, to answer your question.
The name Kairi means Sea.
Spoilers:Near the end of Kingdom Hearts 1, Sora learns that to free Kairi, her heart must be returned to her. Finding that Kairi exists within himself, he unlocks his own heart with Riku's keyblade, releasing Kairi's heart, but losing his. As a result he becomes a Heartless while simultaneously spawning Roxas, his nobody.
Kairi's heart is used for summoning Kingdom Hearts for her purity. Sora vanquishes his own heart to revive Kairi but turns into a Heartless and creates Roxas (Sora's Nobody) and Naminé (Sora and Kairi's Nobody) in the process.
Namine, Kairi's Nobody, was created when Kairi lost her heart, while Roxas, Sora's Nobody, was created when Sora lost his heart. Because Kairi's heart was in Sora, Namine could control Sora's memories. Namine can take anyone's memories.
When Kairi lost her heart, Sora sacrficed himself then gave it to her. She was alive, but Sora turned into a heartless in the process. Kairi then gave a bit of her heart (which was his) to him.
When Kairi was near the weird door on Destiny Island near the beginning of the game, a strong wind blew Kairi onto Sora. When he tries to catch her, she touches him, her heart goes into him, and she just vanishes. So the reason she was limp as a doll throughout the entire game was because her heart was in Sora, so Sora stabbed himself with Riku's Dark Keyblade to release Kairi's heart.
Kairi's heart had fused with Sora's so he had to release his own to set hers free.
He gives her his own heart, so she gets a heart, enabling her to live, but Sora becomes a Heartless but turns back because of Kairi.
Namine is Kairi's Nobody. She was created when Kairi's heart went into Sora in the beginning.
No. In Kingdom Hearts only Sora became a "Heartless". However, Kairi initially lost her heart on Destiny Islands. Instead of her heart being consumed by darkness and turned into a Heartless, her heart went into Sora's body because of their shared destiny. When Sora found Kairi's body, he released both his heart and her's. Her heart went into her body while his was Consumed by Darkness and he became a heartless. So They did not simultaneously become heartless because by Sora becoming heartless he gave Kairi's heart back to her. And when Kairi lost her heart, Sora still had his.
Well, Kairi doesn't actually have a Heartess...but Namine is her "Nobody". According to the game a "Heartless" is made when a person yields to darkness and the vessel that has been left with no heart becomes a "Nobody". If you can remember at KH1, Sora gave up his heart for Kairi turning him into a heartless. Since Kairi lost her heart and didn't become a Heartless, she only has a Nobody which is Namine.(my theory for Namine's ability to control the memories of Sora's heart was because of Kairi having Sora's heart and vice versa, their hearts are directly linked.
Duh everybody knows that sora sacerificed himself to save Kairi's heart, thus creating Roxas and Namine. Then Sora turns into sora-heartless and kairi saves him so that sora gets his hearts back. And that is why.
Sora and Kairi's hearts are linked, so when sora became heartless to save kairi, he also created namine' as a special witchcraft nobody True, but Kairi never turned into a Heartless because she had all light in her heart. Her heart couldn't go into darkness, so it went to Sora instead.