Kai is a light gray anthropomorphic bull with glowing green eyes, long black hair, a helmet, two enormous horns shaped like flames and very thick, a green pendant of collected chi, a brown loincloth made of leather, and muscular arms with brown bracers. It is implied that he holds the Pandas responsible for turning Oogway against him from teaching him the ways of chi. Kai holds great hatred for his former friend, Oogway, stating that he "loved him like a brother", and believes that Oogway betrayed him. He added that Kai is also extremely vengeful and treacherous, and a "bitter, bitter guy". Simmons, has said that Kai will be "not happy about life in general", but will have a sense of humor, "even if it is a little bit dark". He does not like to be interrupted when he is talking, as seen when he got very annoyed when Po wasn't willing to listen and continuously butted in with "chit-chat". There is currently little known about Kai's personality, though he is described as being an "evil spirit". Now, Kai has returned to Earth, where his appetite for power and revenge leads to an incredible showdown and battle with Po. Long ago, Kai is the fearsome, traitorous, destructive, temperamental, manipulative, egotistical, and power-hungry warrior who found a way to take chi from others, until he was banished to the Spirit Realm for all eternity.
3.2.6 The Final Battle with Po and Death.