This is a quick sketch based on the shinto god of lightning, Raijin,'s pet, Raijuu. The pokemon, pikachu is based on this bakemono. In japanese myth, if it storms when you are asleep and if your belly button exposed, Raijuu will come and sleep on you stomach. Raijin gets mad when Raijuu slacks of so he throws lightning bolts at him to wake him up and if you're not careful Raijin's lightning will burn your belly button off! This story most likely is used to keep children covered up on stormy nights so they don't catch cold.