Continuity mistake: When Clark exits the phone booth wearing his blue shirt, only the neck button is unbuttoned in the wide shot. Immediately in the next close-up shot, two buttons are undone. Then in the next shot of Clark's front side, the shirt is back to only the neck button being undone. (00:02:27)
Continuity mistake: During a fight, the thug rips off the bra that Oliver Queen is wearing, rendering him bare-chested. The following shot, taken from a different angle (from the back), shows Oliver still wearing the bra whilst punching said thug.
Answer: No, there is no such character in the comics. He's a "meteor-freak" like all the other baddies on the show. The sound has something to do with him vibrating his vocal cords very fast to create a high-pitched squeal.