They get separated for awhile and as long as Sora and Kairi are together, they are too. :)
Namine
yes
Namine is Kairi's Nobody. She was created when Kairi's heart went into Sora in the beginning.
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.
Like Roxas, Namine is a nobody and she fused with her to become "whole" like Sora and Roxas
Kairi, because Namine is for Roxas. anyways if you played kingdom hearts one and two you would know Kairi and Sora are made to be together. oh and if you played kingdom hearts 358/2 you know Roxas was in love with Xion but he forgot that after he falled a sleep in kingdom hearts 2 to help sora with the help of namine also if you need any more help find me at Quizlla as Shelka
technically namine IS kairi's nobady but made from her memories so her physical form was still intact . just like Roxas and Sora
namine.
SPOILER Because Namine has to put his memory back together.
Roxas merges with Sora near the end of Kingdom Hearts II when Namine merges with Kairi.
technically namine is kairi's nobady but made from her memories so her physical form was still intact
Roxas And Namine Is Apart of Sora, Roxas is The Dark Side of Sora And Namine is The forgetten Part of Sora So he has to Save them In order to be Whole Again