I think those 'space goggles' perfectly fit her sneaking character. But back to clayface, having seen the episode where he comes into The Batman, i can say that this perfectly fits his character and although i was a bit mad at first that he was a whiney cop, his character quickly started to change. He realised that he couldnt just 'be a cop' anymore and had to do something about it. I would imagine turning into a slimey glob of goo who has a hard time keeping his shape would turn you into a madman, and at the end of the episode they show that he is pretty much a madman.