Antonyms of representative:
nonrepresentative, unsymbolic, undemocratic, untypical, atypical, uncommon, unconventional, uncustomary, unusual, unwonted, distinctive, especial, exceptional, extraordinary, infrequent, noteworthy, rare, remarkable, singular, special, unexpected, unfamiliar, unique, unpredictable, eccentric, idiosyncratic, nonconformist, peculiar, unknown, unorthodox, curious, erratic, funky, funny, odd, oddball, offbeat, outlandish, quirky, screwy, strange, wacky, way-out, bizarre, fantastic, far-out, freak, freakish, kooky, out-of-the-way, outrageous, outré, unnatural, weird, wild, aberrant, abnormal, anomalous, deviant, irregular, nontypical, actual, literal, nonsymbolic.
Examples of usage:
  1. The President of the United States, for example, is the representative of a party; but he rules the nation only in part.
    "The Government of England (Vol. I)", A. Lawrence Lowell.
  2. Action is of two kinds,- representative and manifestative.
    "Browning and the Dramatic Monologue", S. S. Curry.
  3. At any rate, he is a representative man.
    "The Religious Life of London", J. Ewing Ritchie.