John and Martha Perfect and their children, Dick and Jane Perfect. The family dog, Spot, also lives in the apartment. To make description simple, the Perfects look like they've stepped out of a 1950's sit com. John was transferred to Nerima by his company.
Their apartment also looks like it came out of the 50's. It is predominantly decorated in avocado, gold, and brown. Dick's room is blue, Jane's is pink. And yes, there are plastic slipcovers on the living room furnature.