Oggy and the Cockroaches influenced by Tom and Jerry
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Oggy is a cat with a light blue body, green eyes, red nose, grey tummy and white feet. Oggy usually spends his time either watching TV or doing housework, when he's 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. Whenever he finds himself alone in his house, he will eventually begin to miss the cockroaches along with their pranks (as seen in the episode "Priceless Roaches" and "So Lonely"/"Alone at last") followed by nothing interesting happening in his life. According to executive producer Marc du Pontavice and France Info, Oggy was named after punk rock musician Iggy Pop and the rock album The Rise and Fall of Ziggy Stardust and the Spiders from Mars. In early episodes, Oggy, like his Tom and Jerry counterpart was the main punching bag in the series.  He also has a fear of heights, as shown in "The Rise & the Fall"/"Vertigo" – however, it only applied for Jack's construction site.
The Cockroaches are a trio of cockroaches named Dee Dee, Marky and Joey (It is also implied that the roaches are named after members of the rock band The Ramones), who love playing tricks on Oggy and other characters such as Jack. However, if the cats left, they would miss each other as seen in "Moving Out". The cockroaches have wide heads, vibrantly-colored sclerae with long, pointed black noses and black feet. They also have black "caps" with their antennae, like Oggy.
Dee Dee is the youngest cockroach with a dark blue body, orange head and green eyes. Always hungry, his appetite sometimes reaches insane proportions, often resulting in the consumption of larger animals or other things that would otherwise be inedible (such as hyenas in one case and, due to the effects of a poisonous mushroom in another case, an insect; other instances include the fish on the wallpaper in "Oggy's Clone"/"Oggy's Costume" and a clownfish in "Scuba Diving"). He is known to like opera, with "Night at the Opera" focusing on this aspect. Sometimes it is shown that his feet are so foul-smelling that the juice they produce is toxic and can melt objects, as seen in "Caught in a Trap"/"High Security Fridge". He is named after bassist Dee Dee Ramone.
Marky is the tallest cockroach with a silver body, green head and pink eyes (originally red). Although Marky originally used to love causing mischief just like Dee Dee and Joey, he has grown to be more laid-back as the series progressed. In most episodes, he is shown with Dee Dee as his partner-in-crime. His hobbies are dating puppets and reading books (though never shown); he also has bad breath as revealed in "It's a Small World"/"Itsy-Bitsy Oggy". While his eyes changed to a less intense color, they turn red again at one point, in "Teleportation". He is named after drummer Marky Ramone.
Joey is a cockroach with a purple-pink body, pink right eye (originally red), a yellow left eye, and a lavender head. Even though he is the shortest roach in the group, he is the most intelligent, always being the brain in the plans, but is sometimes forced to go alone because Marky and Dee Dee often think that his plans are stupid. He loves money, but his efforts always fall short, usually ending with him getting swatted or beaten up. He is named after lead singer Joey Ramone.
Jack is a cat with an olive green body, yellow eyes, red nose, pale pink stomach, and white feet. In contrast to Oggy, he is more short-tempered, violent, and arrogant than him. He often finds himself building huge machinery, such as roach-catching contraptions, and is very interested in physics and chemistry (that is, the more explosive parts of it). Jack has an excellent relationship with Oggy, as he cares about him a lot, especially in the episode "Happy Birthday" where he tries to stop Oggy from committing suicide. Jack mostly lives and sleeps at Oggy's house, and owns a green jeep in which he and Oggy go for a variety of journeys, to the beach, and to go fishing. He is sometimes seen trying to propose to Monica, but the cockroaches' pranks always make it stop. In one episode ("Don't Rock the Cradle"/"Oggy the Babysitter"), Jack and Monica seem to have a baby together and ask Oggy to babysit their child. In "Just Married", Jack plans to get married but it got canceled at the end due to the cockroaches sneaking in and causing trouble.