Nothing written, no interesting buildings.

In fact, the farther he goes, the more dreamlike the whole city becomes.

Does the city spread outwards from the platform, or is it all conveniently on one side of the platform? Because he will go explore this way for a while and then he will go try back the opposite way if this side gets too weird.

It is all conveniently on one side of the platform!

Actually, the platform was on the edge of a circle that is the city, the centre of which he's been going towards.

There... might be something there.

… He'll keep going, then!

Yup. There is definitely something. The something is a stone circle, staying still in the air even though there's nothing to hold it there.

If he pokes it?

It is very solid!

And there's a man standing there, now, with his arms folded and his back to Theo. He wasn't there a second ago, but he didn't really appear. It's more like he'd always been there, but Theo hadn't noticed. The man is shirtless and barefoot, and his stance fails to hide the armour covering his left arm.

"… Hi there."

The man turns around to face Theo, revealing a muscled chest tattooed with a symbol that looks exactly like one Theo's seen on Tidus' shorts.

"Who're you?" the man asks, looking confused.

He does not remark on Theo's nudity.

"Theo," he responds. "Who are you?"

He makes no comment on the other guy's (half-)nudity, either!

He raises a hand to the back of his head and scratches it. "Sin, I guess."

"… And why are you Sin?"

He shrugs. "How it works. Someone has to be."

"Couldn't there just be nobody who is Sin?"

If he tries to turn a piece of the man's clothing blue, does anything happen? What about a piece of his skin, change the color briefly.

Nothing happens. Man's as magical as the rest of the place.

"Ain't that a thought. If you figure out a way to do it, be sure n' tell me. I had a friend once who... Nah."

"– I assume you don't want to be Sin, then?"

"Farplane, no. Who'd want something like that?"

"I didn't realize there was anyone to want or not want it."

"Yeah, guess no one does. I didn't, before. Well."

"Well?"

"Before I became Sin."

"I am missing lots and lots of details on the process here? How did you become Sin, why are you Sin and yet not able to stop it…?"

"I don't really know what happened. I thought we were gonna kill Sin. Then I died. Then I fought Sin. Then I was Sin."

"… I don't understand what it means to 'be Sin'. You don't look particularly Sin-like, nor do you seem like you actively want to hurt people?"

"Well, not right now. But sometimes I do, n' that's part of it. Sometimes I get enough control, and I can steer a little. Away from bigger places, with more people, when I can."