Terabithia is a magical land from Katherine Paterson's Newbery Medal winning novel Bridge to Terabithia. The land has many magical creatures living inside the kingdom, ranging from soldiers, fairies and giants - but all are only the products of Jesse Aarons and Leslie Burke's imaginations.
In the novel, only the giant troll is directly referenced. The Dark Master, Squogers, and Hairy Vultures are all products of the 2007 motion picture adaptation. The Terabithian Fairies (soldiers) who have a strong part in the 2007 motion picture are also shown on the cover art to the 1985 PBS TV Movie.
The Terabithians were briefly mentioned in the novel but play a big part in the 2007 movie adaptation. They are the creatures that live inside Terabithia, they are nice and peaceful beings. The "Bird Woman" and "Soldier Fairies" are two examples. It isn't clear who invented each Terabithian, but in the 2007 movie, it is Leslie that created the soldiers from dragonflies. One could assume that Jess created the rest of the entire civilization by the fact that when they are shown.
The Dark Master began with Leslie's atmosphere building when she and Jesse first went into the woods, but then developed into Jesse's way of dealing with his own father. His father is sometimes hard on him but it isn't revealed until the end of the movie that he was based on the Dark Master. Once Jesse and his father reconciled in the ending, the Dark Master vanished forever.
The Dark Master is rarely seen and only briefly mentioned between the battles in the bridge to Terabithia.
The Dark Master is portrayed by Matt Gibbons in the 2007 film.
The Sqougers were named by Jesse inside the treehouse in Terabithia. It is depicted as a creature that's half-squirrel half-ogre. After Leslie told him its Scott Hoager, he replies with "a Squogre." The Squogers are enemies Jesse and Leslie use to combat Scott Hoager, a bully from the Lark Creek Elementary school. Once Jesse punched him in the face because of his callous remark about Leslie's death, the Squogers vanished.