My mother painted a series of T-shirts for my dad.
This one says 雷 (kaminari) which means thunder. But this is the ancient form of the character.
The guy in the picture is a thunder demon. He's carrying a bunch of drums attached to a ring on his back. He runs around the clouds beating the drums and making thunder. Parents tease their kids that they need to keep their belly buttons covered or else this guy will come and snatch them (the belly buttons, not the kids). I don't know why.
Created: Apr 10, 2014debit72 Image Media