Chef is the octopus chef (and perhaps owner) of the sushi restaurant first visited by Mischief and Henryk in Episode 09. He is theorized to be a being affected by cerebral electricity due to the fact that he is sentient, capable of speech in both English and Japanese, and can survive outside of a marine environment.
Chef is first encountered by Henryk and the viewer in Episode 09, but it's clear that he and Mischief go back further than that. Chef is able to recognise Mischief by voice and color when he enters the restaurant as Henryk's suit and hat. He also confesses to having visions "again", implying that he and Mischief have had conversations about that topic before.
Chef is a large blue octopus with downcast red eyes, wearing a chef's hat and holding a culinary knife and ladle. He looks somewhat old with a slightly worn-looking mantle/head and bags under his eyes.