Shrek is a fictional ogre character created by American author William Steig, who appears as the protagonist in the book of the same name, the 2015 animated series Catscratch Adventures, and in eponymous films by DreamWorks Animation. He is the protagonist of the book and the movies.
Shrek is a large, green, physically intimidating ogre with a Scottish accent. Even though his background is something of a mystery, in the musical and the book, it is revealed that on his seventh birthday Shrek was sent away by his parents because it was an ogre tradition. He is seen traveling alone, either being screamed at or teased by passers-by. The only time he receives a pleasant greeting is a wave from a young Fiona, who is promptly led away by her parents.
In the episode "Shrek Begins", Gordon states that after scaring away an angry mob, he arrives at his swamp, enters an outhouse and literally breaks out as the adult Shrek while kazoo-like fanfare plays. Though surly, misanthropic, and venomously cranky, Shrek is peaceful and doesn't care to hurt anyone, but he just wants to live his life in solitude and be left alone. Shrek is befriended by Donkey, an excitable, hyperactive, and talking donkey. It's notable that when Shrek's first seen, he's successfully scaring off villagers by roaring at them, but it later becomes obvious that they were only attacking him because he's an ogre, not because he did anything wrong.
However, from "Shrek Joins The Team" onward, Shrek has become a well-liked celebrity, at least in Far Far Away. In the upcoming 3rd season, people managed to realize that Shrek isn't dangerous and lost their fear and prejudice over him, but to Shrek's dismay, they also come to regard him as a folk hero and visit him with even more frequency than before, disturbing him. But after the experiences of the movie, Shrek comes to appreciate his life more than ever.
"Ogres are friends, not enemies"- Shrek, reciting the new rule for the team in "Shrek Begins".