Continuity mistake: In the intro to the final scene there is no light beneath the loft doors, yet at the end of the scene during the pullout a light has appear beneath them and it switched on.
Continuity mistake: In the intro to the final scene, the top half of the loft doors are open with the bottom half being closed, yet at the end of the scene during the pullout, both the top half and the bottom half of the doors are open.
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.