A troublemaker is a person, or character, who nearly always gets grounded. Sometimes, troublemakers get ungrounded, as they try to solve problems, rather than creating them. This results them in being ungrounded by their parents as a reward for being good.
Each troublemaker usually creates a problem that always makes his or her parents extremely angry, often resulting in that Troublemaker getting grounded. They normally get grounded as punishment, for being naughty at school. Occasionally, they will get grounded "for nothing", in the event of their parents deciding whether or not they want to ground them, and why they want to ground their children.
Eric and Brian are very famous for being used as Troublemakers. A unique character for a troublemaker is Starscream.