I don't know if anyone already knows this but is how namine was created and why she was able to fuses with Kairi to complete her.
While Roxas is the Nobody of Sora, she is actually a "special Nobody" born from Kairi's heart when it left Sora's body. However as Kairi had no darkness in her heart, Sora's body and soul were used in Naminé's creation. As a result of this, she had none of Kairi's memories. Because of this, DiZ states that Naminé's birth was special and her powers could only effect the memories of Sora and those whose hearts are connected to his, which was why she was used by the Organization.
p.s.don't flame me i only tryin to help
While Roxas is the Nobody of Sora, she is actually a "special Nobody" born from Kairi's heart when it left Sora's body. However as Kairi had no darkness in her heart, Sora's body and soul were used in Naminé's creation. As a result of this, she had none of Kairi's memories. Because of this, DiZ states that Naminé's birth was special and her powers could only effect the memories of Sora and those whose hearts are connected to his, which was why she was used by the Organization.
p.s.don't flame me i only tryin to help