Lilliputian, Tom Thumb, a nobody, a nothing, brownie, cipher, common man, dummy, dwarf, elf, figurehead, gnome, homunculus, insignificancy, jackstraw, lightweight, little fellow, little guy, man of straw, manikin, mediocrity, midge, midget, nebbish, nobody one knows, nonentity, obscurity, peewee, punk, pygmy, runt, scrub, shrimp, small fry, small potato, small potatoes, squirt, squit, wart, whiffet, whippersnapper