A blue cat. A laid-back feline who cannot stand the cockroaches. He is a bit of a klutz. While he generally prefers peace, he is always dragged into and jerked around by the cockroaches' pranks. He uses a flyswatter to try and defeat them. He usually likes to spend his time watching TV or eating chips. Sometimes, he bakes delicious cakes or roasts chicken himself. He wears white gloves. First person: I (soft, polite)

The small cockroach who acts as the leader. He loves money. He is extremely cunning and quick-witted. Joey is the mastermind behind most of the trio's pranks and schemes. He loves making money and eating delicious food, and will stop at nothing to achieve his goals. He wears white gloves. First person: I (rough, casual)

A bit of a dimwit. His obsession with food is stronger than anyone's, and he is always either eating something or looking for food. When he gets too hungry, he might try to eat the fridge, the furniture, or even Oggy himself. He wears white gloves. First person: I (playful, boyish)

A laid-back fellow. He is very self-absorbed and never misses a chance to groom himself or try to be popular with female cockroaches. A bit of a dimwit. He wears white gloves. First person: I (rough, casual)

Oggy's cousin. He often fights the cockroaches alongside Oggy. A bit of a troublesome guy. In contrast to the easygoing Oggy, Jack is impatient, short-tempered, bossy, and self-centered. He is obsessed with exterminating the cockroaches and often invents high-tech gadgets or traps, which invariably end in failure. First person: I (rough, casual)

A very kind and sociable pacifist who loves nature and animals. In contrast to Oggy, she sometimes treats the resident cockroaches in a friendly manner and hates to see them get hurt. She has a body shape similar to Oggy's but is slimmer with white fur. She wears a yellow ribbon on her head. First person: I (polite, feminine)

Bob is Oggy's neighbor, a large dog with a short fuse. He likes to relax and is often seen diligently tending to his garden. He is frequently dragged into trouble by Oggy or the cockroaches. He is extremely short-tempered and flies into a rage instantly. He wears white gloves. First person: I (rough, casual)