First up Wild West Exodus, which appears to be similar scale and has some very fitting minis. I quite like the first as a desperate merc or a gunslinger, the second just struck me as a really interesting undead model, perhaps Flesh Construct.
Next up, this is Niven from Studio McVey, which looks like it would make a good Steampunk Abomination.
This would make a good Gaki
And last up, I thought these would make excellent Fire Gamin