This post is essentially just a "Where does one draw the line with Death" entry for you to let me know just how much Death will know/notice about your character(s) since he is both an omniscient and omnipotent being. While he is from the "Supernatural" universe, he has acknowledged in canon ( see S7E1: "Meet The New Boss" ) that he is well aware that other worlds and universes exist beyond the one he has been residing in.
This means that he can recognize your character and know all there is to know about them. What this post is for is to tell me whether or not I am permitted to allow him to open his mouth about any of it should he ever, for some odd reason, be remotely interested in doing so. Seeing as he isn't the sociable type he isn't about to go spreading the news over the Network. If anything, this would just make conversations with him a little more entertaining!
So please let me know in the comments your characters and any important/relevant facts Death would be aware of about them. And if there is anything you don't want him to mention outside of said character, or have him not take notice of period, please let me know too. This is a permissions post after all.
I am asking for your permission. I am not assuming anything.