* If "representative" means a person who acts on behalf of others: The opposite could be individual, personal, private, or unrepresentative.
* If "representative" means typical or characteristic: The opposite could be unique, exceptional, uncharacteristic, or atypical.
* If "representative" means a delegate or elected official: The opposite could be constituent, citizen, voter, or individual.
To give you a more accurate answer, please provide more context about what you're looking for. For example, are you asking about the opposite in a political sense, a social sense, or a mathematical sense?