Unlike other Fraggles, Boober does not like fun and games and spends most of his time worrying about doom and disease. When he's not worrying about himself, he's busy warning others. He is easily frightened and suffers from a variety of phobias like a fear of heights (as seen in "Sir Hubris and the Gorgs" when Boober was at the bottom of the five Fraggles' Sir Hubris disguise). Because of his fears, he is very knowledgeable about health and superstition. He has a lucky charm for just about anything -- often multiples.
Aside from his friends, there are only two things in life that Boober is very fond of: laundry and cooking. Boober is much like a Cave Fraggle, though this may just be a coincidence. It is unknown exactly whose socks Boober is cleaning; the only Fraggle known to wear them is Uncle Traveling Matt.
According to the episode "Bored Stiff", he also likes to warn other Fraggles of impending doom.
As the series progresses, Boober gradually and notably becomes less pessimistic in personality and eventually begins to appreciate some of the fun things that Fraggles usually like to do!
According to Henson.com's 2006 featured character profile:
- According to Boober Fraggle, there are only two things certain in this world: death and laundry. Boober is terrified by the former and fascinated by the latter. He is also paranoid and superstitious. According to Boober, anything that can go wrong surely will, and when it does, it will inevitably happen to him. Boober denies that he is a hypochondriac; he claims he is just practicing the symptoms because he’s bound to get the diseases. But Boober’s negative attitude has a big plus – he can see real trouble coming a mile away, a useful attribute in a land of eternal optimists. Boober’s two joys in life are doing the Fraggle laundry and cooking. He loves spending a fine morning washing socks, an action-packed afternoon watching them dry – and a delightful evening baking up a delectably light radish soufflé to serve to his friends.
Boober Fraggle appeared in A Muppet Family Christmas with the other four Fraggles. He suspected that Kermit the Frog and Robin the Frog are disease-carriers which Kermit stated that they weren't. He and the other Fraggles later appeared during "The Holly and the Ivy" number when they pop up to see where the songs are coming from.
Jerry Nelson originally wanted to play Boober and asked Jim Henson for the role, but Henson could see Nelson doing Gobo and convinced him to play that role.