The first one is a bodyguard to the merchants, he is based on a Poxwalker with the head and arms of a Genestealer Cults Neophyte and a greenstuff cowl.
The second is one of the traders. He is based on a Chaos Cultist model with a Crypt Ghoul left arm and a Freeguide Archer right hand, and the missing part of his cowl (that was part of this model's left arm) has been rebuilt with greenstuff.
The third is the head of the group. A big chap, looking closely at something he is considering buying maybe? He is based on another Poxwalker, with a left arm from a Sentinel Pilot and a right are from a Freeguild Handgunner. His baggage is from various kits, including Space Marines, Orks, Cadians and Dwarf Quarrellers. He also has a greenstuffed cowl.
The last one of the group is another bodyguard. He is the least converted - a poxwalker with some parts removed and a greenstuff cowl.
Next up is Cable. He is a Champion for the Slipgibbets. He is simply a Goliath Ganger (with some armour left off) with a left arm from the out-of-production Chaos Forsaken kit and shoulder armour from a Dark Elf (right) and a Orruk Boar Rider (left).
Update 11/07/2018 - I've added more rust and highlights to Cable's armour:
The whole Slipgibbets gang with their truck, The Stranger.