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.
Characterization Characterization or characterisation is the representation of persons (or other beings or creatures) in narrative and dramatic works of art. This representation may include direct methods like the attribution of qualities in description or commentary, and indirect (or "dramatic") methods inviting readers to infer qualities from characters' actions, dialogue, or appearance. Such a personage is called a character. Character is a literary element.