Concept numero A: Opium-addicted [s]Dutch[/s] Foreign arms dealer. Undecided on what his weapon would be but it would probably have the soul of his son in it.

Concept exhibit 2: a sort of disaffected onmyouji, irritatingly upbeat in the face of what is essentially an apocalypse. This one needs more time in the oven, but I think the weapon will be an odaichi with the soul of his apprentice.