Kai is a fox and serves as a villain in the online game Kung Fu Panda: Tales of Po. He first appeared in the game's fifth chapter level entitled "The Fox Behind the Mask".
Kai as a Kung Fu master goes to the Jade Palace to refine his techniques, among which there's also a very powerful one that allows him to disappear and reappear where he wanted to. Then while he's visiting the lower floors of the Palace, he finds a room with inside an ancient mask. He's attracted by the mask and puts it on his face, so to become ten times stronger and ferocious. So Po and the Furious Five fight and beat him, bringing him back to normality.
While Kai is in his evil form he uses often chi-techniques and, thanks to the mask's power, he manages to perform very fast offensive loads against the opponent. Furthermore, during the fighting, he often disappears and then rematerializes himself in another place, to avoid the opponents' blows.
Before becoming evil and after returned normal, Kai wears cream color trousers and shirt, except that the edges of the sleeves and the collar of the latter are dark gray; two white wristbands and a red belt. Also, to the neck he wears a necklace with big pearls. Once he puts on the mask, his sleeves are torn and the pearls of the necklace becomes tear-shaped with a dark blue core.