Bradley "Brad" Buttowski is Kick and Brianna's older brother, and the on & off main antagonist of Kick Buttowski: Suburban Daredevil. He bullies Kick (whom he calls "Dillweed") frequently, tries to flirt with girls, thinks he's popular and is very lazy. He also has poor hygiene.
Most episodes featuring Brad have him in an antagonistic role versus Kick. They fight, usually pretty violently, though they're more destructive to their surroundings rather than each other. In "Tattler's Tale" it's revealed that both Brad and Kick enjoy their fights with each other and will go to great lengths to cover it up from their parents, suggesting they are friendly fights.
In "A Very Buttowski Mother's Day", Brad is convinced that he has "second place" in his mother's heart, and so tries to ruin Kick's present to get 'first place'.
Brad is usually seen hanging out with his friends Horace and Pantsy. They tend to act as his lackeys, performing whatever task he asks of them. Why they tolerate this is as of yet unknown.