Thor

Thor (starring as the poor unsuspecting girl bear) in the infamous "yawn technique" demonstration with Bree (the boy bear with questionable motives).

Thor is Bree's stuffed bear. At first known merely as "teddy" (in the episode titled "What Did Daniel and Dad Talk About?"), he was named after Jessica Rose's real life friend Thor Knai in response to fan suggestions[1].

Thor went from total obscurity to infamy in just one episode, My First Kiss (which is when he was finally named), due to Bree's "make out" session with him, to the envy of many fans.