No, that's one of the things that make the kind of ghost he is different. He was actually born a ghost. I know that makes no sense, but it's how his sort of ghost works.

[He blinks and looks around a little.]

He's gone? Hm. Well, he likes to hide in someone's shadow, then jump out and scare them. He thinks it's funny. But I'm not sure that would work with you...

[Does she even have a shadow? Meanwhile, there go Gengar's eyes opening in Morty's shadow, and a flash of a grin before they're gone again.]