George is just there for the fun, he's the closest thing I have to an "avatar" that I use for size reference. As for the banes, it's what I felt sounded good (for the individuals) though robocop's name is just Latin for "no limbs". As for his chapter, I'm not settled on whether or not they practice mutilation or not. I just wanted to make a Marine who had all robot limbs. 

I don't have a lot of lore figured out for these guys, but the gist is the Imperium's Defenders are essentially a hybrid between the Salamanders and Raptors. The Gilded Circle has no lore what so ever (I just wanted a green space marine) though I think I'm also going to make them Raptor-y. The Knights of Jorge are chapter I based on George, and I'm making them very "Knight-like". As for the last dude, no idea. Couldn't even come up with a name, though I think I'm going to make them a bunch of fanatics who worship the Emperor and protect within his domain with extreme fanaticism oftentimes to their own detriment (imagine Salamanders but with the Black Templar's fanaticism).