He is portrayed as an ambitious, ruthless, and ill-tempered businessman, lacking Scrooge's tendencies towards generosity and compassion. He rarely has issues breaking the law, cheating, and using other unfair tactics in order to fulfill his goal of becoming the world's richest duck.
His appearance is similar to that of Scrooge Mcduck, and like Scrooge he is of Scottish descent. He wears a full beard and sideburns as opposed to simple side-whiskers, and a green tam o'shanter with a red pom pom, green kilt and blue coat.
Flintheart and Scrooge come head to head several times throughout ser series, like in the four-part story "Catch as Cash Can", were the two have a contest, weighting their money, to see who will sell the firefly fruit. To improve his chances to win, Glomgold helps the Beagle Boys escape prison, and hires them to steal Scrooge's fortune.
In another attempt to get richer than Scrooge, Glomgold, this time aided by Dijon, spreads metal mites to devour Scrooge's money. As seen in "Attack of the Metal Mites", Glomgold almost succeeds.
In the two-part series finale, "The Golden Goose", Glomgold almost beats Scrooge with the help of the Golden Goose, but temporarily gets turned into gold himself.
In a 1988 DuckTales comic book story, Cosme Quartieri and Jorge Sanchez, a nephew of Glomgold's appears, the smart and brave Junior.
Flintheart appears in booth 1989's "DuckTales" and 1993's DuckTales 2. Notably, in the "bad ending" of the later, Scrooge and his nephews can be seen watching a TV show explaining that Flintheart has retrieved the Treasure of McDuck, making him the greatest adventurer in all the world.