6. Manhawks
Who? Massive hawk-like aliens with human faces that hop from dimension-to-dimension stealing things. Seriously.
Why We Won't See Him... Alright, so where do I even begin here. Manhawks are said to have human-like intelligence, so I can only imagine they are aware of how impossibly stupid they look. In truth, I almost pity them. There is something compelling about how unfortunately these creatures are. Despite probably being the most noticeable-looking things in any given area at a time, Manhawks are somehow adept at stealing things without being caught. I dont even know how thats supposed to work, though Id imagine it would be a rather effective distraction if you ever did catch them in the act. Despite the alternating horror and sadness I see while looking at them, Manhawks wouldnt be an acceptable villain for a DC cartoon show, let alone a DC blockbuster.