Last one looks sort of like an Assassin. The second one's leg armor is kind of odd, though, and he doesn't look like he needs the I'd go with one or three. I don't think three needs a powder horn, though, considering that it appears as if the gun fires some sort of advanced or magical projectile.
I don't know anything about your project, but 3 looks like he could be an enemy of sorts (unless you were going for an anti-hero look, then he's fine!)
I'm torn between 1 and 2 myself - I think I like 1 a bit more than 2 because I'm not overly keen on that brown bracer (?) on his leg on design 2. However I like that neck guard on 2, but I prefer 1's shoulder armour style.
P.S. I hope my comment isn't too confusing to read xD