Exeggution wants to help any Psymonsters and solve problems, but he can sometimes crave nothing but chaos and mischief. Because Exeggution has a very perplexing personality, he constantly tries to influence other Psymonsters in an extremely clever way. As a result, everything good that Exeggution tries to do ends up at least a little bit bad, and everything bad that he tries to do comes out a little bit good. According to the other Psymonsters, it actually makes him a pretty decent friend, if anyone doesn't mind all of the argumentative discussions.
He is a big white egg with yellow eyes, black eyebrows, a mustache, a beard, and a black bowler hat with a red band, purple gloves, a green shirt, a navy bow tie, blue clothing with sky blue stripes, and orange shoes.
- His name is a combination of "egg" and "execution".
- He bears a physical resemblance to the character in an English nursery rhyme, Humpty Dumpty.
- Like Icecrusher, Exeggution wears purple gloves.