Here is the status of characters from my playthough of all DLC:
1 - Greece
* Deimos is alive, no longer baddie Deimos, an ally sibling who works on the Adrestia and has dinner with Myrrine
* First blade baddies (Hunter, etc.) all dead, never see them again
* My spouse dead, no way to save them, never see them again in Underworld Elysium.
* Brasidas and Phoebe die, no way to save them in Greece. Can save them in Underworld with careful choices.
2 - Elysium
* Leonidas is alive and fishing. No need to kill him. He suggests an alternate plan, to bring the spy alive but stunned to Persephone
* Elpenor, Monger, Octopus - Tartarus, the "hell" of the Underworld
* Persephone is still running Elysium when I last saw her going into the big pit in her temple. In Atlantis, records show the other Isu think she's a psycho
* Hekate - given a spell that makes her tell the truth, no longer Persephone's friend.
* Hermes - alive
* Adonis - banished with no facial disfigurement
3 - Underworld
* Brasidas was here due to a serious error in judgement but was convinced (by me) that he wasn't at fault, war was at fault, so he deserves to go to Elysium
* Hades - defeated in battle by me, stays in the Underworld. Atlantean Isu also consider him to be mentally unstable.
* Phoebe - was here, now with parents in Elysium after some help from me
4 - Atlantis
* Shut down by me with the help of Poseidon. Wild adventure before that and well worth popping the cost of the DLC, IMHO.
Way late, I'm sure this won't be read but if it is by some chance, the reason phoebe and brasidas are offered as options to resurrect even if they haven't died during your gameplay:
Ubi kinda backed off explaining this in games, making time seem chronological with your gameplay, but in every game the modern day character is simply reliving memories of the past character through the animus. They make this very confusing (and far more fluid from a gameplay perspective) by allowing you to fast travel mid storyline and dive into foa if you simply meet the level requirement. I believe the in game explanation for this is the evolution of the animus over the years...they touch on the "new version" they are using every game but I like most don't do much more than skim and brain dump this info.