Calvin Clam is shown to be a bit narcissistic and cares quite a lot about his company. He knows an attractive model when he sees one, and usually does all he can to recruit them for his magazines. He recruited the Gunk Knuckler in "Underpants-Palooza".
Calvin Clam is an anthropomorphic clam. He has white hair and long lips with red lipstick. He wears black glasses and a shell covering a black shirt.