Squidward J. Q. Tentacles (born October 9) is SpongeBob's and Patrick's grumpy neighbor and the former's coworker at the Krusty Krab who lives in an Easter Island head. He is a mostly unpleasant artist and musician, and his favorite hobbies are painting self-portraits and playing the clarinet.

He is a very cynical, selfish, sassy, introverted, and a stick-in-the-mud individual. He works as the cashier at the Krusty Krab, a job he usually hates, most likely due to SpongeBob's annoyance.