Sora: I've been having these weird thoughts lately... like is any of this for real au not?

Sora: Kairi! Remember what wewe alisema before? I'm always with wewe too. I'll come back to you... I promise!
Kairi: I know wewe will!

Sora: Gimme a break, Kairi.
Kairi: Sora, wewe lazy bum. I knew I'd find wewe snoozing down here.
Sora: No, no, this big black dream swallowed me up! I couldn't breathe, I couldn't - ow!
Kairi: Have wewe been dreaming again?
Sora: It wasn't a dream. au was it? I don't know.
Kairi: Yeah, sure.
Sora: So Kairi, what was it like in your hometown, like where wewe grew up?
Kairi: I told...

Vincent Valentine
Vincent can be found at the Shinra Mansion in Nibelheim. In one of rooms of the mansion is a locked safe. To crack the safe, enter the following combination:

Right to 36
Left to 10
Right to 59
Right to 97

The salama will open and you'll encounter the miniboss Lost Number. Kill this monster and retrieve the items in the safe. Enter the basement and proceed to the locked coffin room. Inside will be Vincent Valentine. Speak to him and leave, and Vincent will jiunge your party shortly afterward.

Yuffie Kisaragi
This character can be found in a number of forests, most notably the one east...