Thinking behind them was that the heads would be like lab experiments by some peach scum mad scientist, grafted onto bodies made from parts of killed people, using weapons built directly into/onto their arms. I wasn't entirely sure where I was going with them, I just wanted a faction/group of ridiculous enemies I could assemble in great numbers with no real requirement for special parts, they're basically like Cannibals from mass effect 3, shown below
reference picture
