[ Thanatos is in his cabin with the lights off. However, the light from the ICP glows bright enough to show Mort on the table, wiggling his nose at the screen. Thanatos is off to the side, writing something in the dark. It's fine. He's a child of Night. ]

Shades are still themselves, even separated from their body. If that wasn't the case, then the Underworld would not need the amount of recordkeeping we have. The difference here is if they chose to escape to the Void, then there is a chance they could gain a new body instead of remain in their afterlife.

[ He sighs, knowing full well what he senses on the train. Meanwhile, Mort squeaks and waves at Romeo. ]

Well, maybe they could even after they died. The rules aren't as strict out here.

As for memory... those who drink of the Lethe are still themselves. Even if they were to completely forget who they were, there are others who remember, and even if someone completely lacks their memory, then... they make new memories and still become a person.

[ Thanatos has no idea if he's explaining himself right. He still doesn't know what it means to be a person, but he's recognizing that he is one now, wants to remain one. (He still thinks it's different for gods.) ]

... If you are at least wondering about these things... that makes you a person, I think.