Roger Martin Klotz is the main antagonist, and a supporting character, of the Nickelodeon and Disney animated series Doug. He is Doug Funnie's enemy (and later, his friend), and often goes to great extents to bully him or make him look stupid in front of his crush, Patti Mayonnaise. Having being held back several times, he is in the 6th grade at Bluffington School
Roger is poor and lives with his mother, who is a monster truck driver. Due to the fact that he repeated the sixth grade about three times, he is about 14-15 years old.
He has a cat named Stinky and appears to be loving with his family despite the fact that he is rude to most kids in school. His three best friends are Ned Cauphee, Willie White, and Boomer Bledsoe. In “Doug's Worst Nightmare”, he also develops a crush on Doug's older sister Judy Funnie. (Which is short lived)
Despite his grades being terrible, Roger is far from being stupid or untalented. Roger has been shown several times to be something of a renaissance man as he is quite gifted in the arts such as painting, acting, ballet dancing and playing instruments. (He’s good at painting, to the fact he can outclass Doug.)
Although Roger has three best friends who are loyal to him (unless they are afraid of getting in trouble), most people in Bluffington dislike him due to his bullying and obnoxious behavior. He doesn't seem to mind this position, however, and revels in it, unless he wants to impress a girl.
Voice actor Billy West says Roger is thrown in prison, but has yet to say why.
