Chris is alive and totally human, though he has no canon last name. I figure this won't really come up anyway so feel free to assume she sees it but just gloss over what it actually is.

Ruby (corundum) is inhuman but appears human since she's inhabiting a vessel, but she herself is a demon (and in SPN canon therefore essentially a warped ghost.) Her vessel is devoid of a human soul and technically dead, so I imagine Misa wouldn't see anything from it either.