*Selphie sighs gently, because this couldn't be a nice thing to have to hear. But, of all the people Kairi could talk to, Selphie is at least one who really understands forgetting things*

No, Kairi, I think you're still you. Just you don't remember what happened before. Maybe it will come back to you, I don't know... But looks like this is a side effect of you dying.