Kai was the baby dragon inside the dragon stone, Danzi and Lu Yu's baby. Kai hatched at the end of the first boo. He was purple as a baby, green scales growing later. Ping eventually let him go as he became the leader of the last wild dragon. Kai is in Dragonkeeper, Garden of the Purple Dragon, Dragon Moon, Blood Brothers, Shadow Sister and Bronze Bird Tower. After Ping died, her (alot of greats) grandso, Tao, became Kai's dragonkeeper.