Jackster just can't keep himself from laughing at his own jokes. He is a pro at puns, riddles, tongue-twisters, and magic card tricks, but as much as his audience may acknowledge his outrageous wisecracks and medieval celebrity impressions, he acknowledges the Psymonsters even more. He can't even get through a simple knock-knock joke without bursting into peals of laughter before he gets to the punchline. It is hard to be funny all of the time, but Jackster makes it look so easy. Everything he sees – and says – tickles his funny bone until he is giggling, guffawing, chuckling, chortling, and rolling around on the floor during each performance. And once he gets going, the whole regal court of the Psymonster World can't help, but any Psymonster joins in the fun and laughter.
He is a handsome jester with tan skin, brown eyes, black hair and eyebrows, a blue and red motley costume, a green belt, white gloves, his right shoe is blue, his left shoe is red, an alternating colored and scalloped collar, and his hat has gold bells.
- In etymology, Jackster is made from the combined words of Jack and Jester.