Tobi and Obito

[Cloak]

Kind of obvious that The Spiral looking guy is Tobi.

That must be him because he has the exact personality and Zetsu calls him "Good boy"
http://www.youtube.com/watch?v=IyFIje4ll_I

It could be that Tobi was just a cloak on Obito's body at this point in the video.
That could be why he has two personalities/voices
But there are still a lot of possibilities that i don't know or thought of.

ALSO, they can both be two separate people.
I don't have my facts straight but can't Zetsu turn Shapeshift himself to look like a person?
Maybe Tobi shaped himself to look like an Akatsuki Member and Obito was just in a different location.
But that doesn't explain why he was able to solidify himself during Sasuke's fight with Deidara.

So, I'm going with #1, Tobi is a Cloak on Obito's body for a majority of the scenes.

[thegame]

Maybe

[Shunsin no Shisui]

***** I was thinking the exact same thing and was gonna make a similar thread but looks like you did the job for me.

[scorpiowarrior]

Yeah, probably.

[asdeiro]

yeah maybe