Boo Radley in the eyes of Jem and Scout is seen as a monster. On page 16 Dill asks Jem "Wonder what he looks like?" To which Jem replies, "Boo was six and a half feet tall, judging from his tracks, he dined on raw squirrels and any cats he could catch, that's why his hands were bloodstained. If you ate an animal raw, you could never wash the blood off. There was a long jagged scar that ran across his face; what teeth he had were yellow and rotten, his eyes popped, and he drooled most of the time." Earlier in the story we don't really see him so he doesn't have many 'habits' all we know is that apparently Boo drove scissors into his dad's leg. We don't know of his appearance yet but late in the book he looks like just a normal guy. The only actions he really does is he starts to leave presents in the knothole for Jem and Scout. He also puts a blanket on Scout when she is outside when her neighbor's house is on fire (I think it's miss Maudie)