One is the name of a character, played by Ron Perlman of "Beauty and the Beast" fame, in the French film, "City of Lost Children." He is a strongman in the local freakshow, able to burst free from chains by breathing air deeply into his lungs and expanding his chest cavity. There seems to be an allusion in the film that he's actually a child, who has the body of an adult. This would explain his seemingly moronic qualities.
His adventure begins when he loses Denree, his little brother("petit frere" in French), and goes on a quest to find the boy and bring him back to safety. Eventually he gets caught up in a plot to steal a safe. It is this act of fate, that eventually leads him towards his final goal. In the process meeting various, interesting characters along the way, who are as strange and unique as he is, if not more-so.