He is the leader and oldest of the three.
In the episode "The Ghost Hunter"/"Ghost Hunting", Oggy kills the cockroaches but is terrorized by the spirits. 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.
Oggy usually spends his time either watching TV or doing housework - when not chasing the cockroaches.
Oggy, an anthropomorphic cat, would prefer to spend his days watching television and eating, but is continuously pestered by three roaches: Joey, Marky and Dee Dee.