An unlikely hero is someone who is not expected to be brave or courageous, but still manages to do heroic deeds. The crossword solutions for the term 'unlikely hero' are 'WIMP' (4 letters) and 'COWARD' (6 letters). WIMP is a slang term used to describe someone who is weak or cowardly, while COWARD is a more formal term for someone who lacks courage. Both terms imply that the person is not expected to be a hero, but still manages to do something heroic.