Ren would ask about Ryoji, but that would have to be later.

He nods. "I didn't even realize at first what was going on, but as soon as the scene ended, I got control of my body back."

It bothers him a lot. Not only because of the idea of losing control of his body like that is scary, but it makes him wonder if the Metaverse or the TV World or the Dark Hour were to become a thing again, would he be able to be Joker again?

Or would he have to face himself to get his personas back?

"I guess in a way it kinda makes sense. Hyde was Jekyll's darker side, the bad parts of him. Perhaps Hyde could be considered Jekyll's shadow."