[quote=@ShadowKingman]
I'll take out the Lifespan thing, but without it otherwise there shouldn't be much of a problem as she's basically a dullahan akin to a fairy who just really really likes trains. 

The USA presence isn't a thing - it's not even anywhere near Gensokyo; it's knowledge from outside the barrier. I only put it in there as an example of her train nerdiness; I can easily take that out. 
[/quote]

Okay, it's... just [i]really[/i] unfitting. Even putting aside that a dullahan is not actually a psychopomp, just a crazy unseelie fae... well, there's overlap. So much overlap with the shinigami that it's plain weird. And the train doesn't fit the setting, particularly when dialled up to an invisible unstoppable go-anywhere luxury deal. 

And the "see souls of the dead!" thing... well, uh...

Seiga, all the divine spirits hanging around, Yuyuko, Youmu's ghost half, the evil spirits in the Forgotten Hell, and probably Mima all spring to mind immediately for highly visible and annoying souls, spirits, etc.
[s]
[sub]And I think that an embodiment of death would just be a gothloli fairy.[/sub][/s]