Squidward Tentacles (voiced by Rodger Bumpass) is SpongeBob's prickly neighbor and co-worker on the cartoon series SpongeBob SquarePants.  Squidward has a light blue-green body and wears a yellow polo shirt.  As a squid, Squidward has several more legs than any human who might decide to dress up as him.  If you want to just wear the costume without the extra limbs, that's certainly fine.  If you decide you'd like to have a little fun and DIY a few extra legs, consider using pool noodles and following a tutorial like this one.

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