OOC - General
The world-building you've got looks fun to me!
I think it would be really cool if there was some kind of cold-war going on in the background. Maybe there was a war that ended a couple decades, and neither side feels like they won and are still maneuvering in the background, trying to get the upper hand, collecting weapons, ancient knowledge, powerful individuals, etc, to get ready for when it heats up again.
Personally, for my character, since we're going with an action/horror vibe, I'd like to torture him a bit. I'd like to find half-clues and rumors about his family's fate, but I never actually want to be on their trail or find them. They are his motivation and grief.