Quite possibly the only member of The Warriors who's never changed is FRED2L, otherwise known as Ro-Jaws. Without a doubt, the ex-sewer droid is one of O'Neill's more bizarre designs. The most striking thing about Ro-Jaws is his, well...jaws, and here it's pretty obvious to see that O'Neill sourced his design from botanical close-ups of a leech's mouth, to which Ro-Jaws bears an uncanny resemblance...

As you can see from the images above, later artists gave the teeth a more piranha-like sawblade style, but O'Neill's formative design of a boiler with shark's teeth and a leech mouth remains almost completely unevolved. Who knows, maybe he has something in his contract that forbids any artist to give him a facelift. Whatever the case, it renders Internet pages about his various designs pretty much irrelevant.