mendicant

bohemian, bum, clochard, drifter, hobo, tramp, vagabond, vagrant

guttersnipe, urchin, waif

miserable, pauper

bludger [chiefly Australian & New Zealand], cadger, hanger-on, leech, moocher, parasite, schnorrer, sponge, sponger

dependent

deadbeat, derelict, idler, ne'er-do-well