He is a light green sea cucumber. On the top of his head is a set of pale yellow feeding tentacles that looks like a crown, but it is not. The tentacles have an orange outline. He wears blue glasses along with brown shorts and has pink lips.
He is sadistic, treacherous, and ruthless, as shown when he lets SpongeBob try out for the Jellyspotters only to humiliate and belittle him. He also lacks consideration for SpongeBob when he does cruel things for him such as jumping off a building and punching himself in the face. Humiliating and belittling others seems to be a habit of his, as many of his biggest fans have ended up trapped in a crevasse at Jellyfish Fields because of him.
He is also ill-tempered, as shown when he is annoyed by SpongeBob completing all of his given tests with ease. Kevin is also greatly frustrated when all of his plans end up with him getting stung by jellyfish.
Kevin is also ungrateful, as while he acknowledges SpongeBob saving his group from danger and calls him impressive, he still does not let him join because he did not catch a queen jellyfish. This is a mistake that leads to his followers turning on him.
At some point, Kevin became the leader of the Jellyspotters, an expert jellyfish enthusiast club, because of the fashion. The Jellyspotters then once became so popular that Kevin himself was the mascot of his own brand of jellyfish sting ointment.
Having no experience with jellyfish, he was replaced by SpongeBob, who proved to have experience with jellyfish and also saved them from a king jellyfish.
However, SpongeBob quit the Jellyspotters.
Role in series
"I'm Your Biggest Fanatic"
In this episode, he meets SpongeBob and is creeped out by his obsessive fan boy behavior. However, he is greatly surprised when the latter complies with his requests such as jumping off a building and hitting himself. Amused by his attitude, he invites SpongeBob to go jellyfishing with the Jellyspotters who he tells that he wants to embarrass with pranks. He tricks SpongeBob into thinking he can join their club if he passes certain tests, simply so that he can humiliate and belittle him.
However, all of Kevin's plans end up with him instead getting stung by jellyfish one too many times, causing his hatred for SpongeBob to grow. Finally he snaps and says SpongeBob is ready for the final test: use SpongeBob as live bait to catch a queen jellyfish. It is revealed the Jellyspotters were using a robot queen jellyfish. Kevin and his friends then taunt and make fun of SpongeBob by calling him a "loser," but when a king jellyfish appears, he falls in love with the robotic queen and attacks them, Kevin proves to be a coward and admits that he was only in the club for the fashion.
When SpongeBob manages to ward away the king, Kevin is ruined when the Jellyspotters rip off his crown-like cranium and put it on SpongeBob.
He appears at the Hotel Halibut's 36th Annual Jelly-Fisher Convention, where fans can meet Kevin and get pictures with him. He later appears at the episode's end, where he runs out of the fumigated hotel.
He does not seem to care about the well being of his fans, as he did not care about SpongeBob punching himself twice or falling off a building.
Along with other fans of Kevin, he neglected them as well.
Kevin's "hat" is actually his tentacles. This is why he was in such pain when the Jelly Spotters forcefully removed it.