Johnnywas once a styx-only ball of fluff that acts a lot like a mischievous puppy. He can't reach his own kingdom, yet, since it's in the sky, but he's got a teepee! And he has a group of calowns that he likes to play circus with. 

Believing him to be cursed, (possibly because of her, since she's a wicked fairy) Calamity is constantly trying to keep him from trouble and find a way to break his curse.

Eastwood is the one who contributed to his jar (in canon) and he and Clint are now stuck with the title "Daddy."