official informationThis page is home to what is officially known information published about Kairi, which I'm taking as being her respective journal entries in game. Kairi has a number of these from the different games, so we'll be looking at them in game order.
Kingdom HeartsFirst Entry
Islander. Kairi, Sora, and Riku were best friends. They built a raft to sail out and see new worlds. The three were separated when a mysterious force struck the Destiny Islands. Thus did Sora's search for Kairi begin.
Kairi, Sora, and Riku always hung out together. When their island vanished, Kairi lost her heart. It turned out that it was hidden within Sora's. As one of the princesses with the power to unlock the secret Keyhole, Kairi restored Sora's heart when he was turned into a Heartless.
Chain of MemoriesSora's Story
Sora's childhood friend. Sora's journey began as a search for Kairi, who disappeared when their island home was swallowed by darkness. Kairi was held captive by the Heartless, but thanks to Sora she and the islands were saved. She waits there for Sora and Riku's return.
Riku and Sora's friend growing up. Kairi vanished when their home islands were devoured by darkness. Riku and Sora both journeyed to find her. Kairi was held captive by the Heartless, but thanks to Sora, she and the islands were saved. She waits there for Sora and Riku's return.
Kingdom Hearts 2First Entry
Longtime friend of Riku and Sora, and one of the Seven Princesses with ties to the Keys and Keyholes. Not long ago, when she was lost in the darkness, Riku and Sora both tried to save her, each in their own way. Thanks to them, Kairi was able to return to her home islands, but her memories of Sora were gone, and she soon stopped visiting the islands where they once played.
Longtime friend of Riku and Sora, and one of the Seven Princesses with ties to the Keys and Keyholes. She had lost her memories of Sora, and after they returned, she wanted to meet him more and more with every passing day. Falling through an unexpected hole into the darkness, she arrived in Twilight Town and befriended Hayner, Pence, and Olette before being captured by Axel. Kairi is fervently hoping to meet up with Sora once more.
Birth By SleepA girl with the mysterious ability to drive the Unversed away. Her heart is pure light.
Dream Drop DistanceSora and Riku's childhood friend. As one of the seven princesses, she became a target of the forces of darkness, but thankfully Sora and Riku came to the rescue. She is waiting in the Destiny Islands for their safe return.