Roger is a turquoise octopus who only appears in the episode "Cephalopod Lodge."
He is a large octopus who wears a red robe and the standard Cephalopod's hat. His nose is even more bulbous than Squidward's. He has turquoise skin and small red eyes.
He is a member of the Cephalopod Lodge, exclusive to other cephalopods like himself. He came in the Krusty Krab in a disguise to tell Squidward about the big night's meeting at the Lodge. However, he becomes angry with Squidward accusing him of bringing SpongeBob and Patrick along and banned him from the club.
When Roger was talking to Squidward in the Krusty Krab, he is green. However, when he is at the Cephalopod Lodge, he is blue.
This might be explained by the fact that it was night instead of day in the later scene.