He is a turquoise colored octopus that is similar in appearance to Squidward. He wears a jester outfit that is colored crimson and burnt orange, and has a black colored belt with a gold buckle. Much like Squidward, he plays the clarinet, and also sings.
He met the time travelers SpongeBob and Patrick while he was in prison, and set out with them to rescue Princess Pearl. They succeeded, and at the end, Squidly accidentally went to the future, to SpongeBob and Patrick's time.
"Does thou talketh to me?"
"Scoff not, young squire. Thou has mistaken me for another. I am Squidly, the king's royal fool. Or at least I was until I royally messed up."
"Everyone be-ith a critic."
Squidly is most likely the reason of why Squidward is such a terrible clarinet player, since Squidly cursed his future descendant, Squidward.
He is not as hostile towards SpongeBob and Patrick as his descendant is.