Oggy is an overweight blue cat. Oggy usually spends his time either watching TV or doing housework - when not chasing the cockroaches. Despite the constant mayhem caused by the cockroaches, Oggy has developed a sort of love–hate relationship with them, having lived with them for a long time.
Joey, a pink-bodied, purple-headed roach with a pink right eye and yellow left eye, is the self-proclaimed leader of the roaches. He's the brains behind the operations, but is sometimes forced to go solo, because his companions often think his plans are stupid.
Marky is a suave heartbreaking, grey-bodied, green-headed roach with pink eyes; he is the tallest of the three roaches and often doesn't really care about what the two others are doing. His hobbies are dating puppets and reading books.
Dee Dee is an ever-hungry cockroach. His appetite sometimes reaches insane proportions, often resulting in the consumption of larger animals or other things that would otherwise be inedible. His feet are so foul-smelling, the juice they produce is toxic and melt objects.