Ohwun De Maal was a male Duros who made a living as a freelance flight instructor while also engaging in occasional smuggling activities. He and his spouse, Chachi De Maal, jointly ran several docking bays located within the spaceport of Mos Eisley on the planet Tatooine. To conceal their identities during illicit operations, the couple frequently adopted aliases; Ohwun went by Ellor Madak and Ellorrs Madak.
Back in 0 BBY, Ohwun and Chachi were conversing inside Chalmun's Spaceport Cantina in Mos Eisley when a group consisting of Luke Skywalker, a moisture farmer, and Obi-Wan Kenobi, a Jedi Master, walked in. The pair glanced over when the newcomers became embroiled in a dispute at the bar, and soon after, Skywalker and Kenobi left Mos Eisley aboard the Millennium Falcon, a YT-1300 light freighter that was stationed in one of the De Maals' hangars.

Married to Chachi De Maal, a fellow Duros, Ohwun De Maal was a male who, together with his wife, managed multiple docking bays at the spaceport in Mos Eisley on the planet Tatooine. He also worked independently as a flight instructor and sometimes as a smuggler, regularly piloting deep-space voyages with Chachi that included stops at Mos Eisley. To maintain secrecy during less-than-legal activities, the pair frequently used alternative identities; Ohwun went by Ellor Madak or Ellorrs Madak, and Chachi used the name Baniss Keeg.
Back in 0 BBY, Captain Han Solo, along with his co-pilot, Chewbacca, had their YT-1300 light freighter, known as the Millennium Falcon, secured in Docking Bay 94, a bay owned by the De Maals in Mos Eisley. While the freighter was in their care, Ohwun and Chachi were deeply engaged in a heated discussion in Durese, leaning against a wall in one of the booths closest to the entrance of Chalmun's Spaceport Cantina in Mos Eisley when Luke Skywalker, a local moisture farmer, entered the cantina accompanied by Obi-Wan Kenobi, a Jedi Master, and the droids R2-D2 and C-3PO.
When Skywalker and Kenobi got into an argument with the criminals Doctor Cornelius Evazan and Ponda Baba at the bar, the two Duros glanced at the disturbance but soon returned to their private conversation. Kenobi and Skywalker then hired Solo to transport them to the planet Alderaan, and by the time Skywalker and Kenobi departed the cantina, Ohwun had moved to a table with the Givin smuggler Elis Helrot.

Shortly after, Solo shot and killed the bounty hunter Greedo in a booth directly in front of Ohwun's location and quickly exited the cantina. He and his passengers then needed to execute a hasty exit from Docking Bay 94 in the Falcon following a blaster battle with a squad of Imperial stormtroopers within the bay. Ohwun was later questioned about Greedo's demise and testified that the bounty hunter's blaster had been out of its holster at the time of the shooting, which was indeed accurate.
During his visit to the cantina, Ohwun was seen wearing a silvery white flight suit. He also possessed a personal blaster pistol.

Ohwun De Maal made his debut appearance in the original trilogy movie Star Wars: Episode IV A New Hope, which premiered on May 25, 1977. Jon Berg, a modelmaker, played both Ohwun and Chachi without receiving credit at different instances, and Kim Falkinburg also took on the role during additional scenes shot for the cantina sequence on a sound stage in Dovington's Hollywood studio between January 24 and 25, 1977.
The characters' simple, pull-over masks were created from a single sculpture by Phil Tippett, which was then duplicated in latex. The masks measured 20 inches by 12 inches by 12 inches (51 centimeters by 31 centimeters by 31 centimeters) and featured a slit in the back for easy wear, secured with a Velcro strip on the inside. The interior of the mask was filled with foam for support. The eyes were crafted from plastic, painted with speckled red, and the characters were nicknamed "Goggle-Eyes" on set.
One of the Duros masks became part of Tippett's collection and underwent conservation work by Tom Spina Designs, who repaired splits in the latex and created a custom support to maintain its form. In 2016, the mask was in generally good condition with some minor wear and was auctioned for $55,000. Only Chachi was given alien hands, while Ohwun was visibly wearing gloved human hands in the film. The blooper reel for A New Hope shows that on one occasion the actor playing Chachi accidentally struck the actor playing Ohwun too hard, breaking a finger on the alien glove.

Ohwun's spacesuit was a repurposed studio costume, originally made in silver for the 1966 Jerry Lewis film Way…Way Out. These suits were then reused in the 1967 film In Like Flint and in a two-part episode of The Green Hornet television series titled "Invasion from Outer Space," which aired on March 17 of that year. On September 26, 1969, they appeared in "Pheasant Under Glass," an episode of the Get Smart television series, and then in 1971, they were painted white and used in the film Escape from the Planet of the Apes. Before Star Wars, one was used in a sketch called "Planet of the Shapes" on The Bob Hope Show on September 13, 1971. For A New Hope, Berg wore the suit with knock-off white Adidas sneakers, and two other cantina patrons, often called the "spacemen," wore the same suits. An alternative Duros costume, featuring a silver jacket, black pants, and alien gloves, was also used at one point.

Within the current Star Wars canon, Ohwun was first identified by name in the mobile card game Star Wars: Force Collection, which debuted in 2013. Despite the game's launch preceding the Star Wars canon reset in 2014, Leland Chee of the Lucasfilm Story Group verified that the game was consistently updated to align with canon. Later, the 2016 reference book Star Wars: Complete Locations introduced "Ellor Madak" as another name for the character, and the 2023 bust of the character by Gentle Giant Studios used the name "Ellorrs Madak."
All three names originated in the Star Wars Legends continuity. Ohwun De Maal was initially mentioned in the 1993 Star Wars: The Roleplaying Game supplement Galaxy Guide 7: Mos Eisley by West End Games, penned by Martin Wixted, though the name wasn't linked to the Duros seen in A New Hope. A card in the 1995 "Premiere Limited" set of the Decipher Star Wars Customizable Card Game identified the film character as "Ellorrs Madak." "The University of Sanbra Guide to Intelligent Life: The Duros," an article in Wizards of the Coast's Star Wars Roleplaying Game magazine Star Wars Gamer 2 in February 2001, clarified that Ohwun De Maal and Ellorrs Madak were the same person, with the spelling "Ellor Madak" introduced by James Luceno's 2004 reference book Inside the Worlds of Star Wars Trilogy.