Honestly, I don't get why people think a story having unrelatable characters is such a bad thing. John's life before SBURB was about as "normal" as they come. Rose lived in a remote area, Dave didn't go to school, Jade and Jake both lived on islands in the middle of the Pacific Ocean, Jane was the heiress of a worldwide empire, and Roxy and Dirk lived in the future where they were the only humans left. Every other character is an alien. They shouldn't be all that relatable.