Aside from the fact he's much cooler than Jon, (He inherited Liz's hair colour and more mature attitude) he has some similarities. He lives alone in a huge house with two pets despite not seeming to have any sort of job note , and is sometimes the Butt-Monkey of the pet's antics. These comics in particular just scream "Jon Arbuckle"
When Sweet was born alongside his eight sisters, he was the smallest and weakest among them all. Then he discovered video games at an early age, and the experience transformed him and allowed him to grow and develop into a pretty alright guy. How could video games turn a little tiny kitty into a big towering cat? Because they can.