The Futures of Howard Chaykin

Howard Chaykin has worked with a number of science fiction properties in comics over the years: Star Wars, a graphic novel adaptation of Bester's The Stars My Destination, and a Watchmen-ized DC science fiction characters with Twilight. He's also done a few original science fiction charatcers:

Ironwolf
The Hero: The tartan-wearing, outlawed lord of the planet Illium. The sort of guy willing to slap a Galactic Empress over a political disagreement.
Appearances: Weird Worlds #8-10 (1973), Ironwolf: Fires of Revolution (1992).
The Setting: The Empire Galactika in the 61st Century, a time of spaceships made out of anti-gravity wood, vampire legions, and swashbuckling. I talk about it more detail here.
The Look and Feel: probably Burroughs and Alex Raymond inspired. Futuristic guns and swords are in wide use. Most male characters dress a bit like Raymond characters, while the female ones seem to wear hippy or disco inspired outfits.

Cody Starbuck
The Hero: A space pirate. A guy who will charge a nobleman twice the ransom price to rescue his kidnapped bride-to-be then receive fellatio from the woman on the flight home.
Appearances: Star Reach #1,4 (1974, 1976), Cody Starbuck (1978), Heavy Metal (May-Sept., 1981).
The Setting: It seems to drift a little over time, but always a far future galactic society, where an empire has fallen to be replaced by feudalism. A corrupt future version of the Catholic Church is a frequent villain. The first story mentions wooden and crystalline spacecraft, but later stories show fairly standard sci-fi ships.

The Look and Feel: Initially this swashbuckling future is very Alex Raymond (probably by way of Al Williamson), but the later stories show the influence of Star Wars and probably other 70s science fiction film. The level of technology is increased in the later stories. Being in more adult publications, the series is more explicitly sexual.

Monark Starstalker
The Hero: A space vigilante, former rigger (a pilot with his nervous system linked to his ship), rebuilt by aliens and given a robot hawk that he's telepathically linked with. He's the sort of guy that's disliked by both sides in the war, but still manages to right wrongs and get the girl.
Appearance: Marvel Premiere #32 (1976).
The Setting: A space frontier in rebellion against the Federation that founded it. It has riggers that link with their ships and "terranizers" that are some sort of terraforming device.
The Look and Feel: It's sort of Western meets Science Fiction at a time of galactic civil war (a year before Star Wars and an over two decades before Firefly). The clothing and equipment is a bit like the Cody Starbuck stories this same year, but there aren't any swords.

Reuben Flagg
The Hero: An actor from Mars (who lost his job on Mark Thrust, Sexus Ranger to a CGI duplicate of himself) drafted into becoming a real-life lawman in Chicago. The sort of guy that likes to listen to jazz.
Appearance: American Flagg! #1 (1983).
The Setting: A somewhat dystopian, very 80s 2031, where the U.S. government and most major corporations fled to Mars during a crisis in 1996. A media-saturated, corrupted, and violent former America is controlled by the new corporate-governmental entity known as the Plex. Many cities have become arcologies called Plexmalls.
The Look and Feel: A vague hint of the pulp era (zeppelins, stockings and garters), filtered through a whole lot of 80s. Consumerism, pervasive media with subliminal messages, a bit of Judge Dredd-ian urban dystopia. A talking cat.