Dex had a furry friend named Ferbus, a small bear/duck-like creature that followed him to Earth. Ferbus was kept hidden by Molly and Albee because Hal was allergic to fur. Ferbus is eventually revealed to the entire family during the course of the series.

Dex is a loquacious individual. In the first episode, Molly and Albee told him to speak like a regular person, and that he could learn how to do that by watching TV. Sadly, Dex misunderstood and spoke like a television show announcer.