What heroic qualities are anti-hero, Seth Gecko, lacking?
Antihero An antihero, or antiheroine, is a protagonist who lacks conventional heroic qualities such as idealism, courage, or morality. These characters are usually considered "conspicuously contrary to an archetypal hero". Although antiheroes may sometimes do the "right thing", it is often for the "wrong reasons" and because it serves their self-interest rather than being driven by moral convictions.
Dark Hero Dark Hero is a 1946 thriller by Peter Cheyney featuring a Chicago gangster involved in the gang wars of the 1930s, who during the Second World War finds himself in Nazi-occupied Norway and becomes a hero of the anti-Nazi resistance - by applying essentially the same skills which had made him a successful and feared gangster.