S
Samebito
  (Japan)
  A black monster with green glowing eyes and a spike beard. On the Long Bridge 
  the monster encountered the hero Totaro, but instead of attacking him, the monster 
  entreated him to give it food and shelter. It turned out that the sea-king had 
  expelled it from the ocean. Totaro took the monster with him and gave it a lake 
  near his own palace where he fed it. Some time later, Totaro fell in love with 
  the beautiful Tamana and intended to marry her. Tamana's father however, had 
  set the bride price at 10,000 precious stones. Unable to come up with such an 
  immense fortune, Totaro went home and lay ill until he was dying. When Samebito 
  learned of what happened to its benefactor, it shed tears of sadness until the 
  monster discovered that its tears had turned into pearls, rubies and emeralds. 
  With these precious stones Totaro was able to pay the bride price and marry 
  the lovely Tamana.