I just read a spoiler that said episode 1×20 will be titled “The Stranger.” This is the same episode that had behind the scenes stills of Pinocchio. So, it looks like we finally have an answer to who the stranger is. I was hoping that he'd turn out to be Peter Pan. Well, at least we know he's not Rumepl's son. Because that's the Mad Hatter. 😆
I’ll try to locate the exact article where I read it.