No one at all
no one, not anybody, not a soul; see none 1.
A person of little importance
upstart, cipher, nonentity, nullity, jackstraw, parvenu, whippersnapper, no great shakes*, man of straw*, punk*, a nothing*, nix*, zero*, schlepp*, nebbish*; see also sycophant.
A totally insignificant person:
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