This was a few hours before the war, and Orochimaru already re-animated the previous Hokage, and Orochimaru had them back in the lab, since Orochimaru had to do something, and the four wondered into the room you happened to be in, in a testing tube that glowed a blue color.

Tobirama: What the hell is this place?

Hashirama: I'm unsure, younger brother.

Hiruzen and Minato stayed silent, as they tried to figure out what was going on.

Your appearance is how you choose it to be.