They are not going to be great on the table (in Kill Team) without Looters, Burnas, Shoota Boyz or Kommandos but I might add a few more models to fill in those gaps later.
Throttle used to be part of the infamous Blood Axe warband known as Da Fifty Fiff Bad Redz Brigade, but he was outcast because he was far too interested in loot, and not interested enough in the militaristic formalities the Bad Redz delighted in. He became a Freebooter and set off with a very small group of Boyz loyal to him. Since hitching a ride on a Space Hulk that dropped out of warp space in the Ghoul Stars he has gathered a few more followers to his crew.
He is often exasperated and constantly frustrated by the failures of his warband. He just wants a "job" to go to plan; just once!
Warphead Ghizzud was a member of a Snakebite clan until he Jumped a whole warband into a nest of angry dino-squigs. He was the only survivor and the rest of his tribe made it clear they didn't want him around anymore. He was exiled when the rest of the clan made planetfall to join Waaagh! Bork he was set adrift alone in a space hulk.
The hulk slipped into the empyrean again and he was carried on the tides of the warp to the Ghoul Stars where he was found by the Dust Hogz when they boarded the hulk. He was... changed somewhat by the journey, but Warboss Throttle saw how powerful he was and made it clear that he was now part of the crew.
Bossnob Nognox is a loyal first mate and a tough, deadly fighter. He has been at Throttles side since the "old days" in the Fifty Fiff.
Draktor is the warband's heavy weapon specialist. And he is a bit thick. But since his brings the big guns and seems to know not to shoot anyone on his side the others put up with him.
Smarg is a sarcastic bastard with a bionik eye. He never says what he means and what he says is always mean.
He claims to have been to Lesotho Two-Twelve, but no one believes him.
Mugwak is a miserable git. He mourns the loss of his lost mob-mates, and keeps a Slugga from each dead Nob as a memento, believing that he will gain some of his dead mates' strength by carrying them.
Nognox and his Krew
Hoop and Twitch are the warband's fetchers and carriers, dogsbodies and slaves. They run errands, carry messages, fetch ammo and try not to get trodden on. The class a day when they don't nearly die as a good day. They have only been with the warband for a few weeks, they don't know but they are the latest of a long line of Grots that usually have very short lives in the Dust Hogz and they are already well past their expected "expiry date".
Boss Nob Woz and his Boyz Boyz are all Freebooterz - they have been kicked out of their old klans for their strange ways.
Boss Nob Woz
Mudguts - Ork Gunner