episode ("Back To School"), he was presented as a teacher of Oggy and Jack. Oggy's grandma is the least known member of Oggy's family who appears in several episodes, including "Granny's Day" and "Oggy's Grandma" (where she appears to be very strict with Oggy's mannerisms). She also makes a cameo in "Deep Trouble" where she supports Oggy and Jack with Monica. In "Granny's Day", she attacks the cockroaches but is actually attacked by them in "Oggy's Grandma", one time getting her head flattened by the lid of Oggy's toilet. She also gets frequent, short-lasting bursts of energy from coffee, which aids her in defeating the cockroaches. In "Granny's Day", she captures Joey and Marky, but feels sympathy for them, when Dee Dee cries on a picture of the trio with the other two crossed out. Monica is Oggy's twin sister and Jack's love interest, the latter of whom she has a child within "Oggy the Babysitter"/"Don't Rock the Cradle"). Known for being active and likes to take on physical challenges such as sky diving and bungee jumping, she is sometimes seen rollerskating. Of all the characters, Monica has the least appearances, although she makes a brief one in "Oggy Is Getting Married", where she sits next to Bob. She later plays a major role as Olivia's rival in the episode, "Sharing Oggy" (although they later become friends). Olivia is a white cat with a yellow bow on her head who debuts in season 4, and becomes Oggy's girlfriend. Olivia is aware of the cockroaches' mischief, so she stops them when they are around by using some aggressive methods. In "Oggy and the Not-so-Smart Bracelet", Olivia actually retaliates toward the cockroaches, strangely enough. Olivia cares a lot about her appearance as seen in the episode "Olivia's Pimple", where she refuses to leave her house when she saw a pimple on her face. In "Oggy Is Getting Married", as the episode title implies, Olivia and Oggy get married after a trip to Venice, Italy and she currently becomes Oggy's wife. However, their life after said marriage is not shown later in the series. Lady K is a light yellow female cockroach who debuted in the episode of the same name (in season 4), as the cockroaches' new love interest (mainly Joey's). She lives in Olivia's house which Olivia is not aware of, and hates her for unknown reasons. She frequently attempts to