King Kai has a strong sense of humor, so much so that before he can agree to train someone, they have to make him laugh, and he tells very bad jokes. He is at least somewhat aware that his jokes are considered bad, as when trying to get Goku's attention while trying to telepathically warn him to finish off Frieza as the latter was powering up, he threatened that he'll start telling jokes, adding he has a lot of them if Goku doesn't respond to him soon, and even came close to carrying out the threat before Goku replied. He possesses great intelligence and knowledge about the universe and specializes in universal telepathic links.