A autistic nail :)
Nail is scared or made sad easily. He is very weak, as said by Muffin, and was eliminated very early in the show. Nail didn't get to make a lot of friends cause he was the 2nd off the show. In season 2, he gets his own radio show, claiming that his voice was "soothing", but it is very unpopular. There is a recommended character on BFDI that is a Nail. Nail won Ep. 14 by bringing Micro back and picked Chalky to be in the finale with him.  (Found information OSC wiki)