From WordNet (r) 3.0 (2006):
blighter
n 1: a persistently annoying person [syn: pest, blighter,
cuss, pesterer, gadfly]
2: a boy or man; "that chap is your host"; "there's a fellow at
the door"; "he's a likable cuss"; "he's a good bloke" [syn:
chap, fellow, feller, fella, lad, gent,
blighter, cuss, bloke]