Mordecai is one of the main protagonists of Regular Show, along with his best friend Rigby. Mordecai is a 23-year old blue jay. He made his debut in a non-canon short as a human cashier, who then morphs into a prototype Mordecai-like character with a fanny pack. He later makes his first official appearance in the Pilot episode.
Mordecai is mild-mannered and laid back. Like Rigby, he lacks clothing, plays video games, sings karaoke, and drinks copious amounts of coffee and soda. Of the duo of two main characters, Mordecai displays far more patience, responsibility, and intelligence than Rigby does. Although almost every problem caused by the duo is Rigby's fault, Mordecai does cause problems at times, though they are unrelated to work. An example is in "The Unicorns Have Got to Go" when Mordecai tries to attract Margaret with DudeTime, but ends up attracting a group of ill-mannered, lazy, and irresponsible unicorns that wreak havoc.
Mordecai puts up with Rigby's laziness and immaturity, once even filling out a job application for Rigby because he claimed it was "boring". Mordecai tends to be more sociable and friendly than Rigby, and has much more manageable relationships with others. Although Mordecai naturally despises work, he strives to keep a good reputation, once almost losing his life to avoid being labeled as a slacker, and vouching for extra work to pay for concert tickets. Unlike Rigby, Mordecai doesn't talk about or openly express himself or his feelings. Therefore, Mordecai's most obvious shortcoming is his inability to engage his love interests by speaking his heart. Whenever he is around his crush, Margaret, he will often stutter or lose focus. In spite of this, he often makes up excuses to go to The Coffee Shop just to see her. He is a serious person and wants people to do the right thing. It is also proven that he is fond of the word "dude" and the saying "oooooooh", as he and Rigby often exclaim. [Source: wikia]
You can download the papercraft model here: Regular Show - Mordecai Mask Free Papercraft Download