Phantom, with being a mercenary/assassin and whatnot, would probably be paid well, as usually the kind of people who actually need mercenaries are old, retired millionaires with a grudge (i think.). So his net worth would probably be around 1.5 million total. You may be asking why he lives in a ranger tower when he has that much? My explanation is that he has a lot of enemies, and can’t afford to lose a huge mansion or something like that.
K’horr would have none. I’m not sure Xarranians really have money anymore, with living on a giant ship and whatnot.
The Mechanic, when he was alive, had access to lots of parts and scrap. He made money by selling his custom weapons to criminals. I’d say he had around 3 million when he died.