Question: What heroic qualities are anti-hero, Seth Gecko, lacking?

Context paragraphs:
D. J. Cotrona: Donald Joseph "D. J." Cotrona (born May 23, 1980) is an American actor, known for his role in the film "" (2013) and as Seth Gecko in the El Rey Network horror television series "".

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.

Takuma Tsurugi: Takuma Tsurugi (剣琢磨 , Tsurugi Takuma , referred as "Terry" Tsurugi in the U.S. dubbed version) is an amoral anti-hero in The Street Fighter film trilogy, played by Japanese actor Sonny Chiba.  He is a martial arts expert and a mercenary for hire.  As opposed to many heroic figures portrayed in the chopsocky boom of the 1970s, Tsurugi is an amoral antihero who is willing to murder his allies if they are unable to pay for his services.

Virago: A virago is a woman who demonstrates exemplary and heroic qualities.  The word comes from the Latin word "vir", meaning 'man' (cf. virile) to which the suffix "-ago" is added, a suffix that effectively re-genders the word to be female.

Seth Gecko: Seth Gecko is the name of two fictional characters in the "From Dusk till Dawn" film series.  The original Seth is the protagonist of the original film, described as a cool, suave, short-fused, sociopathic anti-hero, in the "From Dusk till Dawn" universe consisting of the 1996 film and its 2001 spin-off video game of the same name.  An alternate universe version of the character appears in the .  He is portrayed by George Clooney in both the films and the video game and is portrayed by D.J. Cotrona on television.

Antihero (disambiguation): Antihero is a protagonist who lacks conventional heroic qualities such as idealism, courage, or morality.

From Dusk till Dawn: The Series: From Dusk Till Dawn: The Series is an American horror television series developed by Robert Rodriguez.  It forms part of the franchise of film, direct-to-video, comic and cult following of "From Dusk till Dawn", expanding on the chronicles of the Gecko Brothers, Seth and Richie; The Fuller family; and Santanico Pandemonium.  The series adds to the tone of the film, with new characters and backstories, while expanding the creatures' Mesoamerican mythology.

Chivalric romance: As a literary genre of high culture, romance or chivalric romance is a type of prose and verse narrative that was popular in the aristocratic circles of High Medieval and Early Modern Europe.  They were fantastic stories about marvel-filled adventures, often of a knight-errant portrayed as having heroic qualities, who goes on a quest, yet it is "the emphasis on love and courtly manners distinguishes it from the "chanson de geste" and other kinds of epic, in which masculine military heroism predominates."  Popular literature also drew on themes of romance, but with ironic, satiric or burlesque intent.  Romances reworked legends, fairy tales, and history to suit the readers' and hearers' tastes, but by c. 1600 they were out of fashion, and Miguel de Cervantes famously burlesqued them in his novel "Don Quixote".  Still, the modern image of "medieval" is more influenced by the romance than by any other medieval genre, and the word "medieval" evokes knights, distressed damsels, dragons, and other romantic tropes.

Richie Gecko: Richard "Richie" Gecko is the name of two fictional characters in the "From Dusk till Dawn" film series.  The original Richie Gecko is one of the main protagonists in the 1996 film "From Dusk Till Dawn".  A nerdy, obnoxious, even-shorter-fused, sex offender, psychopath; that only his brother, Seth Gecko (a cool, suave, short-fused, sociopathic anti-hero), could even stand.  He was portrayed by Quentin Tarantino on film, and an alternate version of the character is portrayed by Zane Holtz on TV.

Mock-heroic: Mock-heroic, mock-epic or heroi-comic works are typically satires or parodies that mock common Classical stereotypes of heroes and heroic literature.  Typically, mock-heroic works either put a fool in the role of the hero or exaggerate the heroic qualities to such a point that they become absurd.

Supporting paragraphs: Seth Gecko Antihero
Answer: idealism, courage, or morality