unwelcome person, persona non grata - a person who for some reason is not wanted or welcome

blackguard, bounder, cad, hound, heel, dog - someone who is morally reprehensible; "you dirty dog"

gallows bird - a person who deserves to be hanged

knave, rapscallion, rascal, rogue, varlet, scalawag, scallywag - a deceitful and unreliable scoundrel

villainess - a woman villain