Yeah, it's like that with Misch too. We can interact with each other, but she can't interact with anyone else (unless she's sharing in the body, she can't take hold of it by herself). Which I think is about the same with you, if I recall correctly?

And she has memories from before being here, but that's partially through my reading/watching her canon and partially just her memories. Lili too to a lesser extent, but having no canon I can't just look up things, either. :P